undeliverable delivery has failed to these recipients or groups

It's an example of just how useful PowerShell is to Microsoft 365 administrators. ([fe80::4813:72b:8e30:b43e%6]) with mapi id 15.20.3499.027; Thu, 29 Oct 2020 Email delivery errors show up on your computers because the address you are using is not recognized as a valid sender or because the ID is blacklisted on suspicion of sending spam mail. Your message wasn't delivered because the recipient's email provider rejected it. I actually DO receive the sent email even though the error message says that the message was undeliverable. Despite repeated attempts to contact the recipient's Your message couldnt be delivered because the group youre sending to needs to know who you are before it will accept your message. Are you able to send any mail to those addresses through your companies SMTP server? X-MS-TrafficTypeDiagnostic: AM6PR03MB3784: Diagnostic Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. The hacker had gotten in and added a forwarding address to the account. Came very close to losing 55k payment on that occasion. If you have another way to get in touch with the recipient, see if they have a new email address. Hi, I am receiving this message when an internal sender, with mailbox on the same Office 365 installation, tries to email security groups from an external mail service, even though that mail service (Pardot) is listed in the domains SPF record. Give them the usernames that you are having problems with as well as a timestamp that the error occured. 11:20:37 +0000 I had the chance to test today but unfortunately it doesn't work with this settings:set-distributiongroup "Displayname of the X-MS-Exchange-AntiSpam-MessageData: 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 A family of Microsoft client/server messaging and collaboration software. If you are using Exchange online, just delete/disable all connectors on Exchange online. The one MS link is to a legit help article. Content-Language: en-US When you send an email and receive a delivery failure message, there could be several reasons. Can you also explain how to setup ReportToManagerEnabled to $true and ReportToOriginatorEnabled to $false. If issue still persists, then reach out to Microsoft Support to unblock IP and Tenant restrictions from Backend. The same message Any help on this issue would be really appreciated. MIME-Version: 1.0 Please check Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Most email service providers impose a limit on the size of messages their users can send or receive. Do suggestions above help? If the question has been answered, please accept the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. 2023 Quest Software Inc. All Rights Reserved. Additionally you should not be sending emails form domain.onmicrosoft.com (Tenant Address) and instead should use Custom domain name. Switch the setting to On to enable external senders to send email to the group. The message headers have references to Intuit. Yes it's correct, when a user sends email from DG email, no NDR is received in case of problem with an email not sent. Would the "SupervisorName" dynamic content in the To field of the "Send an email" action be a accessble email address? However, I do get the message and it is forwarded to my gmail acount from Microsoft 365 Outlook. We have an Exchange 2013 and Office 2010. Diagnostic information for administrators: For more information: Storage limits in Outlook.com. The Domain Name System (DNS) reported that the recipient's domain does not exist. Delivery has failed to these recipients or groups: Your message couldn't be delivered. Sent email in Outlook.com comes back "delivery failed", Can't connect to remote server/message expired, Email could not be delivered to members from the group, Errors that include "blocked" or "listed in" and references to sites like "spamcop," "dynablock," "blackhole," or "spamhaus", Mailbox not found, Invalid mailbox, or User unknown. Please check the recipient's email address and try resending this message, or contact the recipient directly. user1@somedomain.com on 2/24/2021 10:13 PM When an Exchange Online user tries to send email messages to an external contact, the messages aren't delivered, and the user receives an error message that resembles the following: Delivery has failed to these recipients or groups: There's a problem with the recipient's mailbox. Your message is too large for the recipient's email server. The problem is why Exchange did not send the undeliverable email to the email address event if it's a distribution group? I hope the members are added. I'm excited to be here, and hope to be able to contribute. I have been receiving complaints about getting these errorsDelivery has failed to recipients or distribution lists. Delist IP and Tenant from Block using this URL -https://sender.office.com/. As per our observation from last two days, 17 emails have been delivered and anything beyond 17 emails, (Notifications)get undelivered. If your error message says that the recipient's email provider will keep trying to deliver your message, you don't need to take any further action. Sometimes the mail is not delivered and the following error comes in the outlook of owner of the record: Delivery has failed to these recipients or groups: diago_almeida@dell.com Your message couldn't be delivered. Best practices and the latest news on Microsoft FastTrack, The employee experience platform to help people thrive at work, Expand your Azure partner-to-partner network, Bringing IT Pros together through In-Person & Virtual events. Please share more details so we could try to provide a proper workaround for you. I believe the reg has to be on every mailbox server, set-distributiongroup "Displayname of the group" -ReportToManagerEnabled:$true -ReportToOriginatorEnabled:$false, Undeliverable message not received when sending an email from a Distribution Group Universal, Exchange Server 2013 - General Discussion. If the response is helpful, please click "Accept Answer" and upvote it. Find out more about the Microsoft MVP Award Program. From the docs [1]. I made many tests in order From: Mail Delivery System <MAILER-DAEMON@relay-mail01.westnet.com.au> To: Simon <simon@accounts.com.au> Subject: Undeliverable: TV from Ben Delivery has failed to these recipients or groups: simon@accounts.com.au A problem occurred during the delivery of this message to this e-mail address. If their email address is someone@example.com, the domain is example.com. To: CNF , Commercial by . below. Just to confirm Normal user mailbox sends an email to External email address. Personally, I think there is a bug with Outlook, because Im sure of the email address used. To give you a step-by-step guide (for the solution which I think wooGZ refers to): In the Exchange Management Console: open properties of the mailbox (or contact) which outlook cannot send to Inside the tab "E-Mail adresses", add another custom address: Make sure to not have the type set to the default "SMTP" in the Add dialog. Delivery has failed to these recipients or groups: xxxx@xxx.xx' INVALID:xxxx@xxxx.xx) This message was rejected by the recipient email system. undeliverable delivery has failed to these recipients or groups. server: BN6PR02MB2548.namprd02.prod.outlook.com Opens a new window Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system . 2. i changed the Send email" action from Office 365 outlook connector to Outlook.com (using my personal email) and the email are sent successfully. Undeliverable: Delivery has failed to these recipients or groups When I send Emails To Myself From Outlook App On Android. Is DG able to receive External emails? Try sending this message again. Your message We've listed the most common error messages below, along with suggested resolutions. Your message did not reach some or all of the intended recipients. the flow still runs successfully to the end, but the sent emails (from my tenant email: ******@tenant.onmicrosoft.com) become undeliverable to emails outside my tenant, 1. i changed the "To" field to my tenant email (keeping Office 365 outlook connector) and it went through nice and i recived the email in my inbox. To fix this issue your Tenant needs to be added to a sending exclusion for 60 days to allow them to use blocked IPs whilst they still have a new/trial license. Thanks for your information!!! DG Sends and email to XYZ and does not receive the NDR? Indeed If we have this issue is because there is a problem with Exchange or Outlook. information and tips to fix this issue see this article: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=/8cKvsKW7X46K0XPkPcou5lUTGhYhEhC7B938mKOYDQ=; b=qCv921tIg1TMOWLn/96DFiM3CCZ4SqQ0GZCKOsh8eOVw/0e9HTLpu7z2W4S0TGIM3+G0KIoKrYMEJ2lfQUiQ5lLnm8IsRk6ynOY0z1WkkN+Y2L+cJE8DmUKO4eYVFor/7iLwWV+4x/ZtpkTWSgfdbMZUj7PO3ha4p0fMTJTbNQ4=, Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id, 15.1.919.13; Fri, 24 Feb 2017 15:41:07 +0000, 15.01.0919.018; Fri, 24 Feb 2017 15:41:07 +0000, Thread-Index: AQHSjqmsdVYv1+HijkmSS9g+irTlaaF4S4CQ, authentication-results: spf=none (sender IP is ), x-ms-exchange-messagesentrepresentingtype: 1, x-ms-office365-filtering-correlation-id: 94f96dae-44ed-4e10-5805-08d45ccb8cc8. @ankit shukla, 1. you can check for Mail Traffic Report in Security & Compliance Center - Protection.office.com (using your Global Admin Access), 2. Delivery has failed to these recipients or groups: cheryldoel@gmail.com (cheryldoel@gmail.com) A communication failure occurred during the delivery of this message. We can fix the IMCEAX NDR quite easily. The problem appears with many email addresses. Go to Microsoft Community. But before that i just want to clear the base of it. Please visit our Privacy Statement for additional information. However, when you apply a mixture of PowerShell and the Microsoft Translator service, the task becomes so much easier. X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted As the emails work from OWA, Based on the NDR, It seems either the email address is incorrect or the external party has blocked your email (May be SPAM filtering). to understand what appears exactly. Send delivery reports to group managerClick this button to send non-delivery reports (NDRs) to only the distribution group manager. Do not send delivery reportsClick this button to prevent the sending of NDRs. This could be because the recipient's address has changed or the recipient's email account has moved. an SMTP address (IMCEAINVALID-)'. Please check the recipient's mailbox quota. Ive tried to send the same message to the same recipient with Outlook 2010 and 2016, try to delete the user You can also go to Exchange admin Center ( https://Outlook.office.com/ecp ) using your Global Admin and then Navigate to Protection < Action Center for your Blocked Users (from sending emails) 3. If the email is generated by an application maybe the client account has an incorrect email address attached to it? If the issue has been resolved, please click Accept as answer to mark helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well. Harassment is any behavior intended to disturb or upset a person or group of people. This topic has been locked by an administrator and is no longer open for commenting. If you have another way to get in touch with the recipient, see if they have a new email address. Threats include any threat of suicide, violence, or harm to . Please check the recipient's e-mail address and try to resend the message. They are getting errors like the following: Delivery has failed to these recipients or groups: Intended recipientYou can't send a message on behalf of this user unless you have permission to do so. Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that their email system isn't accepting connection requests from your email system. can see that its my local Exchange server that return the error and not any another server. Choose the account you want to sign in with. i am not sure if this is a problem with flow or outlook 365 connector. How do the spoofers know what the subject of an email a person sends? Also, the members of the DG would receive the emails. The NDR states: Your message couldn't be delivered because the group you're sending to needs to know who you are before it will accept your message. another user it works. Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge. X-Microsoft-Antispam: BCL:0; Delivery has failed to these recipients or groups: The recipient's mailbox is full and can't accept messages now. From: Microsoft Outlook Receiving server: BN6PR02MB2548.namprd02.prod.outlook.com Opens a new window Delivery has failed to these recipients or distribution lists: The recipient's e-mail address was not found in the recipient's e-mail system. Opens a new window, These are spoofed NDRs, they aren't really NDRs, just emails designed to look like NDRs so users will click phishing links. Is there a way i can do that please help. Can you tell me where I can check the Email information whether I will check in the Exchange admin center or anywhere else? Can you please help me? Received: from AM6PR03MB5217.eurprd03.prod.outlook.com (2603:10a6:20b:cd::20) More info about Internet Explorer and Microsoft Edge, Remote Server returned '550 5.7.501 Service unavailable. information for administrators: Generating @Preeti321 Any specific reason you want to send emails from your Tenant Address and not your own Custom Domain ? The "554 5.4.0" error is related with too many hops. Remote Server returned '554 5.2.2 mailbox full; STOREDRV.Deliver.Exception:QuotaExceededException.MapiExceptionShutoffQuotaExceeded; Failed to process message due to a permanent exception with message The process failed to get the correct properties. This message means that the recipient has too many messages in their inbox. Hi All, One of my user is facing issue sending email to an external domain user. group" -ReportToManagerEnabled:$true -ReportToOriginatorEnabled:$false. Delivery has failed to these recipients or groups. Here's Microsoft's suggestion for when this happens. Try to send it again later. Please try resending your message later, or contact the recipient directly. can see that its my local Exchange server that return the error and not any another server. I have had this problem for a while and can't find a solution! eGift Cards are delivered via email. For more Keep up to date with current events and community announcements in the Power Automate community. Please try to resend the message later. Try this fix: Check the recipient's email address for typos. Any image, link, or discussion of nudity. Please check the recipient e-mail address and try resending this message, or provide the following diagnostic text to your system . Below are the most common solutions to getting your email delivered successfully: Check the spelling of the email address for typos Check that the person gave you the correct email address my name is***** all of a sudden have been getting "Delivery has failed to these recipients or groups:" before every single email I have received today and I have no idea why, or how to make it stop. You can manage sensitivity label settings through the Microsoft Purview compliance portal, but it's hard to see all the settings for labels in a consumable manner. Are these invoices sent from Quickbooks? RunspaceId : 93d51ae8-6e27-4b67-b3ed-0128982220f1, IsInternal : False, TargetDeliveryDomain : False, ByteEncoderTypeFor7BitCharsets : Undefined, CharacterSet : iso-8859-1, NonMimeCharacterSet : iso-8859-1, AllowedOOFType : ExternalLegacy, AutoReplyEnabled : True, AutoForwardEnabled : True, DeliveryReportEnabled : True, NDREnabled : True, MeetingForwardNotificationEnabled : False, ContentType : MimeHtmlText, DisplaySenderName : True, PreferredInternetCodePageForShiftJis : Undefined, LineWrapSize : Unlimited, TrustedMailOutboundEnabled : False, TrustedMailInboundEnabled : False, UseSimpleDisplayName : False, NDRDiagnosticInfoEnabled : True, MessageCountThreshold : 2147483647, ExchangeVersion : 0.0 (6.5.6500.0), Name : Default, DistinguishedName : CN=Default,CN=Internet Message Formats,CN=Global, Exchange,CN=Services,CN=Configuration,DC=xxxx,DC=lu, Identity : Default, Guid : 7aa21c37-dc3c-47c6-bd2e-a2ffd1de0863, ObjectCategory : xxx.lu/Configuration/Schema/ms-Exch-Domain-Content-Config, ObjectClass : {top, msExchDomainContentConfig}, WhenChanged : 30/08/2015 11:08:01, WhenCreated : 21/11/2003 12:19:00, WhenChangedUTC : 30/08/2015 09:08:01, WhenCreatedUTC : 21/11/2003 11:19:00, Id : Default, OriginatingServer : SVR-DC20.xxxx.lu, IsValid : True, ObjectState : Unchanged. If it's not, update the SMTP value, and then run directory synchronization. The problem appears with many email addresses. If this doesn't resolve the problem, or if the user is using Outlook Web App, go to step 2. I had a similar situation where they hacked an email account and sent an email to a customer - complete with all relevant names, details, logo's, etc. connection requests from your email system. Sorry but I dont really know which key I have to create in the registry. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. The email remains on Exchange server and is not blocked by any spam filter. Please check the recipient's email . Actually a user receives this IMCEAINVALID error when he try to send an email. 2. If this mailbox could send emails to other mail servers, it means this issue related with the MX record for target mail server, you need to contact target mail server administrator. X-MS-Exchange-Transport-Forked: True Remote Server returned '550 5.2.0 RESOLVER.ADR.BadPrimary; recipient primary SMTP address is missing or invalid'. Please make sure you're sending on behalf of the correct sender, or request the necessary permission. You can also go to Exchange admin Center ( https://Outlook.office.com/ecp ) using your Global Admin and then Navigate to Protection < Action Center for your Blocked Users (from sending emails), 3. Are only mails to @dell.com failing or are mails to other domains failing as well? It should be noted that it may take up to 24 hours after deletion to receive mail normally again. If you organization cannot send emails to other mail servers, you can take steps below to solved this issue: If the response is helpful, please click "Accept Answer" and upvote it. Thread-Topic: TEST MAIL We've listed the most common error messages below, along with suggested resolutions. This article describes how to use PowerShell to extract and report sensitivity label settings, including highlighting rights assignments that might be out of date. Try this fix: Instead of sending large attachments via email, upload them to OneDrive and send the recipient a link. What Is the "Delivery Has Failed to These Recipients or Groups" Message? This recipient e-mail address was not found in the recipient e-mail system. Please turn off your ad blocker and refresh the page to subscribe. After connecting to Exchange Online with PowerShell use the Set-DistributionGroup cmdlet to modify the setting. If you have added the recipient as a contact, please check the email address in the contact card. AS (4567)' Original message headers: Webinar: Reduce Complexity & Optimise IT Capabilities. If the self-help doesn't solve your problem, scroll down to Still need help? Your message I have one Office 365 tenant as .onmicrosoft.com. Message-ID: X-MS-Office365-Filtering-Correlation-Id: 70c44563-e63b-4e5c-bf5e-08d87bfca920 Still need help? I wanted to know if i can remote access this machine and switch between os or while rebooting the system I can select the specific os. A legacy proxy address is specified in the external contact's proxy address. Please try resending this message later, or contact the recipient directly. When a group is first created in Exchange Online, whether it is created manually or by a cutover/staged migration, the setting defaults to Off. External emails addresses are Exchange recipients. The Wyndham Rewards Minibar Sweepstakes (the "Sweepstakes") begins on February 24, 2023 at 9:00 PM Eastern Time ("ET") and ends on March 27, 2023 at 9:00 PM ET (the "Sweepstakes Period"). The message body includes the text Delivery has failed to these recipients or groups: [EMAIL ADDRESSES] Examine the text below for diagnostic information returned from the remote server. Select an error below to see more information. X-MS-Exchange-CrossTenant-MailboxType: HOSTED If not, and you are only using it for your Own Learning and testing, you should not use domain.Onmicrosoft.com address for sending emails (except) testing. This is going to get a lot of people for sure as they wont know until someone complains or if they test the address (of course mine didnt even accept from an internal address so still have fingers crossed) Link:https://portal.office.com/adminportal/home#/groups. Copyright 2000-2022 Salesforce, Inc. All rights reserved. One more thing I can tell, This is a new tenant that I have created recently. X-MS-TNEF-Correlator: If the problem continues, contact your helpdesk. See the "User Has a Full Mailbox" section. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Just checking in to see if above information was helpful. Hi, Firstly, you need to check if the email address contains ".", and blank. In Developer Edition organizations and organizations evaluatingSalesforceduring a trial period, your organization can send mass email to no more than 10 external email addresses per day. "Delivery has failed to these recipients or distribution lists: Person B The recipient's e-mail address was not found in the recipient's e-mail system. Generating server: AM6PR03MB3784.eurprd03.prod.outlook.com Post questions, follow discussions and share your knowledge in theOutlook.com Community. Click Contact, select the external recipient, click Edit (. Check out the latest Community Blog from the community! He works as a consultant, writer, and trainer specializing in Office 365 and Exchange Server. another user it works. The primary SMTP address was not added to the external contact's proxy address. THe bounce back received is as follows:- Delivery has failed to these recipients or groups: Could you please share more run details when the flow runs? Date: February 26, 2017 at 10:36:23 AM EST I have to wait that user test it but I'll let you know the result. and select Yes. I decided to let MS install the 22H2 build. Review the email addresses that are shown in the error report. If you are using hybrid, delete all connector from Exchange online, remove send connector from Exchange on-premises, then rerun HCW to recreate them. (auto complete list)and retyping the address . Business process and workflow automation topics. Finally, we have to fixIMCEAINVALID error and why DG is not able to receive NDR. Can someone please help me. The bounce back the user receives shows the attempted delivery to be back to their own email address, and if the user selects "Edit the response before sending" it will send fine without any bounce backs. When an external sender attempts to send an email message to an Office 365 group they may receive a non-delivery report (NDR). Hi Team, Microsoft Exchange will not try to redeliver this message for you. X-MS-Exchange-CrossTenant-Id: 6c1d2bb7-78f0-4dbf-8e70-7c14ad51e0bf Make sure that the proxy address is set correctly in Microsoft 365. I thought at some point Cisco was going to build in the ability to customize the Undeliverable messages. I support several clients using Office 365 and two of them are having the same problem. i have a couple of flows in which i use the send email at the end of the flow, but in the last couple of days all emails which were sent returned "Delivery has failed to these recipients or groups" in my email inbox although when i try to resend the email manually it sends with no failure. Delivery has and was challenged. x-exchange-antispam-report-test: UriScan:(68173958961439)(161960196858918)(105329927740338); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(102415395)(9101524098)(601004)(2401047)(8121501046)(3002001)(10201501046);SRVR:BN6PR02MB2548;BCL:0;PCL:0;RULEID:;SRVR:BN6PR02MB2548; x-forefront-antispam-report: SFV:SKI;SFS:;DIR:INB;SFP:;SCL:-1;SRVR:BN6PR02MB2548;H: X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Feb 2017 15:41:07.4597, X-MS-Exchange-CrossTenant-fromentityheader: Hosted, X-MS-Exchange-CrossTenant-id: 553e7695-6d49-48d4-bde9-675ba3e0aca1, X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR02MB2548. I added a "LocalAdmin" -- but didn't set the type to admin. Updating my comment to advise that I resolved this issue, by changing Group Delivery Management settings to allow email from internal and external senders, and creating a Dynamic Distribution Group containing all internal users, and restricting senders to that list. the recipient's email address and try resending this message, or contact the recipient directly. IMCEAINVALID error and why DG is not able to receive NDR. X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR03MB3784, Have a look at our related documentation and you may want to give a try to see if it helps you to move ahead. "Participating Properties" means the twenty (20) properties listed below, collectively, and "Participating Property" means any individual . Besides, please follow the steps below and clear Outlook Auto-Complete List to see if it helps: Open Outlook. Delivery has failed to these recipients or groups: Stewart Dennis L (*** Email address is removed for privacy ***) Your message couldn't be delivered. To contact us in Outlook.com, you'll need to sign in. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); On the show this week, find out what's happening with recent changes to Exchange Online that might cause a delay if you're setting up a fresh Hybrid environment; plus security recommendations for your on-premises Exchange environment. Help@Mydomain.com). Sharing best practices for building any app with .NET. Please try to resend the message later. See the "Undeliverable Messages Not Forwarded to Recipients" section. This lower limit does not apply if your organization was created before the Winter '12 release and already had mass email enabled with a higher limit. Delist IP and Tenant from Block using this URL - https://sender.office.com/ 4. The LegacyExchangeDN is not missing for my Distribution group (saw in AD, Attribute editor) . And why would either of these companies use a Gmail address in their systems. Documentation - https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/mapiexceptionnotfound-ndr, Hi @Roland Nyambu this not only tags your Tenant address as Blacklisted (for Spam Abuse) but also blocks specific IP (outbound) through which emails are relayed over to Internet. Furthermore when I empty the auto-complete list from Outlook and try to resend the email, it works. Have you checked if the email is sent to your mailbox by the flow some minutes afterthe flow run successfully? When you send an email you receive a new message from Microsoft Outlook with "Undeliverable" added to your subject line.

undeliverable delivery has failed to these recipients or groups 2023