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Some important service:

[Unit] ... OnFailure=status-email@%n.service

[email protected]:

[Unit] Description=status email for %i to user [Service] Type=oneshot ExecStart=/usr/local/bin/systemd-email.sh <recipient> %i User=root Group=systemd-journal [Install] WantedBy=multi-user.target

I'm getting error systemd-email.sh[117310]: ssmtp: Cannot open smtp.gmail.com:587

I can send mail manually ./systemd-email.sh $RECIPIENT $SERVICE_NAME

It's also working as cronjob.

My /etc/ssmtp/ssmtp.conf:

root=<gmail address> mailhub=smtp.gmail.com:465 FromLineOverride=YES AuthUser=<gmail address> AuthPass=<password> UseTLS=YES

Why cron can send mail in this setup but systemd cannot?

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    You posted two items: systemd-email.sh[117310]: ssmtp: Cannot open smtp.gmail.com:587 and later, mailhub=smtp.gmail.com:465. Something is mis-configured in the first case to use port 587 instead of the correct port 465. Commented Jul 26, 2021 at 5:22
  • That's right, I found the problem. In /etc/ssmtp/revaliases I left wrong ports... root:[email protected]:smtp.gmail.com:587 mainuser:[email protected]:smtp.gmail.com:587. Changed them to 465 and it's all working now. Commented Jul 26, 2021 at 10:48

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Per the comments, the problem was an incorrectly configured port number somewhere else. Please consider deleting this question, as the main thing it brings to the community and the site/network is "Why you should do a detailed search/research, troubleshooting, and/or diagnostics to exhaust all avenues of resolving the issue on your own."

The only thing I would add to help other/future users is application of various template files and configuration files (setting an environment variable to the correct value, then using it in other files) to ensure a single change propagates to all sub-ordinate configuration files.

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