I have a home server with a dynamic IP (running Ubuntu 20.04.3) and want to receive the system mails to root as an email. I have set up sSMTP to send email via a Gmail account. Sending emails manually works. Automatically triggered emails caused by system events do not arrive. So I wonder about the difference between sending emails manually and the automatic email events caused by system events.
Here is my sSMTP configuration.
$ cat /etc/sSMTP/sSMTP.conf
# Config file for sSMTP sendmail
#
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.
root=mymail@web.de
# The place where the mail goes. The actual machine name is required no
# MX records are consulted. Commonly mailhosts are named mail.domain.com
mailhub=smtp.gmail.com:587
# Where will the mail seem to come from?
rewriteDomain=gmail.com
# The full hostname
hostname=myhostname
# Are users allowed to set their own From: address?
FromLineOverride=YES
# Use SSL/TLS before starting negotiation
TLS_CA_FILE=/etc/ssl/certs/ca-certificates.crt
UseTLS=Yes
UseSTARTTLS=Yes
AuthUser=gmailuser@gmail.com
AuthPass=gmailpass
Sending emails works in principle. I receive emails correctly for all the following commands.
$ echo "Content" | mail -s "Subject" mymail@web.de
$ echo "Content" | mailx -s "Subject" mymail@web.de
$ echo -e "Subject: SubjectnnContent" | ssmtp mymail@web.de
However, if I trigger an automatic mail to root, things are different. For example, I intentionally give a wrong password for a sudo command.
$ sudo ls
[sudo] password for myuser:
Sorry, try again.
[sudo] password for myuser:
sudo: 1 incorrect password attempt
This issue triggers an email to mymail@web.de, but the email does not arrive. Instead, I get an email to gmailuser@gmail.com with the following error message.
554 Transaction failed Reject due to policy restrictions. For explanation visit https://web.de/email/senderguidelines?ip=209.85.221.44&c=hi
Here is the header:
Reporting-MTA: dns; googlemail.com
Received-From-MTA: dns; gmailuser@gmail.com
Arrival-Date: Wed, 25 Aug 2021 13:14:10 -0700 (PDT)
X-Original-Message-ID: <ID@mx.google.com>
Final-Recipient: rfc822; mymail@web.de
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx-ha02.web.de. (212.227.17.8, the server for the domain web.de.)
Diagnostic-Code: smtp; 554-Transaction failed
554-Reject due to policy restrictions.
554 For explanation visit https://web.de/email/senderguidelines?ip=209.85.221.44&c=hi
Last-Attempt-Date: Wed, 25 Aug 2021 13:14:10 -0700 (PDT)
How can I find out the underlying command used by the automatic email events? And how can I change the automated email events to behave like the manual ones such that I receive the emails at mymail@web.de? Many thanks for any advice!
