Share via

Exchange Cannot Send Email to Specific Domain

Tom Jensen 0 Reputation points
2023-01-12T17:29:28.44+00:00

Domain1 is hosted on Microsoft 365 while domain2 is hosted in gsuite (dns record is at wix.com)

Unfortunately, domain1 cannot send outgoing emails to recipients in domain2 even they are 100% valid and below is the error.

Error: ‎550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient <email address> not found by SMTP address lookup‎

If domain2 will send email to domain1, it will be received as junk. If you will reply to this email, above error will also show.

There are no issues if domain1 will send/receive email to and from other domain.

Domain2 is alredy added on the accepted domain under exchange admin center.

Exchange Server
Exchange Server
A family of Microsoft client/server messaging and collaboration software.
1,135 questions
Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,427 questions
Microsoft Exchange
Microsoft Exchange
Microsoft messaging and collaboration software.
423 questions

1 answer

Sort by: Most helpful
Most helpful Newest Oldest
  1. Jame Xu-MSFT 4,171 Reputation points
    2023-01-13T08:18:42.02+00:00

    Hi @Tom Jensen,

    You could check your anti-spam policy, there may be a policy blocking the communication between domian1 and domain2.

    For the error you provided, you could refer to these two documents：

    Fix email delivery issues for error code 550 5.1.0 in Exchange Online

    (550 5.1.10 RESOLVER.ADR.RecipientNotFound) NDR error when a Microsoft 365 user tries to send mail to on-premises users in a hybrid deployment

    If an Answer is helpful, please click "Accept Answer" and upvote it.

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

    0 comments