Error message: Undelivered Mail Returned to Sender

Question

Hi, 
      I am using Amazon WorkMail through it's webmail platform at https://webmail.mail.eu-west-1.awsapps.com/workmail

I can send OK using the primary email address on the WorkMail user account as the from: address, and I can send ok using most of the other email aliases, but there is one email alias that I cannot send from, or at least when I try I get an immediate bounce email with subject "Undelivered Mail Returned to Sender", and the email is not delivered.

For the email alias that doesn't work as a from: address, the domain part seems OK because I can send from name1@example.com ok, whereas as one particular email address name2@example.com causes the error.

The bounce message more fully is..
from: mailer-daemon@
subject: Undelivered Mail Returned to Sender

Unfortunately, the system was unable to deliver your mail.
The error given was:

2023-06-29 17:13:17 : An error occurred trying to send your message. Error code: 0X80040201

You may need to contact your e-mail administrator to solve this problem.

I'd be grateful to know how I can resolve this error while still being able to send email from my chosen email alias.

Thanks in advance..

Accepted Answer

There could be a few reasons this happens:

1) Issue with autocomplete on specific recipient.   If you are trying to send to a specific contact, delete the contact itself, and do it manually.  Also have you tried to send to other email domains from the email address with the issue?
2) Also related, if the alias that you are sending from is in your address book, you have to delete that record.

Those generally are the most common.  If not I would definitely engage AWS Support.

Error message: Undelivered Mail Returned to Sender

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