undeliverable delivery has failed to these recipients or groups

Do not send delivery reportsClick this button to prevent the sending of NDRs. If issue still persists, then reach out to Microsoft Support to unblock IP and Tenant restrictions from Backend. Diagnostic information for administrators: Generating server: user1@somedomain.com Remote Server returned '554 5.4.0' To fix this problem, as the email admin for the group to configure the group to accept messages from you. Is there a way i can do that please help. We have an Exchange 2013 and Office 2010. Could you please share more run details when the flow runs? Saw that too. X-MS-Exchange-CrossTenant-MailboxType: HOSTED Copyright 2000-2022 Salesforce, Inc. All rights reserved. X-MS-Exchange-CrossTenant-AuthAs: Internal Diagnostic information for administrators: Generating server: SVR-EXCH.domain.local IMCEAINVALID-xxxxx+40xxxx+2Ech@local domain Remote Server returned '550 5.1.0 RESOLVER.ADR.InvalidInSmtp; encapsulated INVALID address inside Fix "Undeliverable" error when sending email | IT Help Below represents my Office 365 Email Id format which I have provided: Can anyone suggest to me how I can resolve this issue? "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. When you send an email you receive a new message from Microsoft Outlook with "Undeliverable" added to your subject line. Resolution Click Contact, select the external recipient, click Edit (. Help@Mydomain.com). 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.

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