Cronjob error emails

I’ve been getting failure messages from my server ever since I did a server update. I think it included an update to python?

The emailed error says :

Traceback (most recent call last):
File “management/email_administrator.py”, line 59, in
msg.as_string())
File “/usr/lib/python3.6/smtplib.py”, line 888, in sendmail
raise SMTPDataError(code, resp)
smtplib.SMTPDataError: (451, b’4.6.0 Alias expansion error’)

What version of MiaB are you running?

What commands did you use to perform the server update?

version v0.54.

apt-get update && apt-get upgrade.

I’ve been using apt and haven’t had any problems. This install has been running since the very first release on 18.04 without any real problems (that I didn’t cause).

The mail server seems to be working fine as far as I can tell. Mail comes in, mail goes out.