Sogo send email to a different domains with same user name fails

Support
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1

NethServer Version: 7.6.1810 (final)
Module: SOGo Groupware

Hello
I have exchange server and sogo with different domain names.
The sogo mail server is sending and receiving emails from gmail, and others.

I tried to send email from sogo - admin account to user in the old server at@test.com, I have a similar user in sogo server at@test.net

after writing the email and pressing send it shows this message

Cannot send message: all recipients are invalid

2

Please have a look at:

/var/log/sogo/sogo.log

and post the section at the time, where you have tried to send the mail.

3

Maillog could be useful too

4

i think you must set under
mail
domain (change)
and set relay to another server
(smtp.provider.com)

5

Thanks everyone for your reply, I Solved the issue. It was my mistake joining the domains.