In Outlook Mobile I can reply but not send new email

Question

We have an on-Premise Exchange Server. When adding accounts to Outlook Mobile we have to use username@domain.local. We then select Exchange, but cannot change the email address. So it remains username@domain.local. This worked, but recently Outlook updated and we cannot send new emails now. Any help would be greatly appreciated.

Answer 1

We have Exchange 2019 on-Premise, and the Outlook client would only work with username@domain.local. Everything worked okay until recently. It was crashing because it didn't recognize username@domain.local. Microsoft must have fixed the app and then didn't allow for this workaround anymore.

Around 5 pm yesterday the Outlook App started working. We can now add the account with our email address alias[username]@domain.com. We now get the Exchange option and Microsoft 365 doesn't kill it. Before when it wasn't working, this is the message we received:

EasSendFailedPermanentException: An EAS Send command failed: The EAS command failed with Status MailSubmissionFailed, Code ='120' and HttpStatus OK. --> The EAS command failed with Status MailSubmissionFailed, Code ='120' and HttpStatus OK.

Failure code: 4995

I think Microsoft fixed the issue. Thanks!

Chad

Answer 2

Hi @ Sams, Chad,

Welcome to Q&A!

Great to know that the issue has already been resolved and thanks for sharing the solution so that others experiencing the same thing can easily reference this!

Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others"](https://docs.microsoft.com/en-us/answers/support/accepted-answers#why-only-one-accepted-answer)%22"https://docs.microsoft.com/en-us/answers/support/accepted-answers#why-only-one-accepted-answer)%22"), I'll repost your solution in case you'd like to "Accept"](https://learn.microsoft.com/en-us/answers/support/accept-answer#accepted-answer-in-a-question-thread)%22"https://learn.microsoft.com/en-us/answers/support/accept-answer#accepted-answer-in-a-question-thread)%22") the answer : )     

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Issue Symptom:

User can reply but can’t send new email in Outlook mobile client.

Details: Outlook client could only work with this kind of email address format: username@domain.local before. So, users signed in with this format. It functioned well but failed recently after Outlook updated.

Error message:EasSendFailedPermanentException: An EAS Send command failed: The EAS command failed with Status MailSubmissionFailed, Code ='120' and HttpStatus OK. --> The EAS command failed with Status MailSubmissionFailed, Code ='120' and HttpStatus OK.

Environment: Exchange 2019 on-premises

Issue start time: Mar 6_th_.

 

Resolution:

This issue has been resolved from Microsoft side.

The cause for this issue is that Exchange server cannot recognize the email address format: username@domain.local.

Now, user could sign in Outlook client with the email address format: ******@domain.com and everything function well.