Unknown user - Email

OS type and version Ubuntu Linux 20.04.6
Webmin version 2.021
Virtualmin version 7.5

After a fresh install of Virtualmin I’m getting this message when I try to send an email to a user:

This is the mail system at host xxxxxxx.

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

xxx-xxx.xxx@xxxxxxxxxxx (expanded from info@xxxxxx.com):
unknown user: “info-xxxxxxxx.xxx”

---------- Forwarded message ----------

Can you please help?


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