$Conf{EMailFromUserName} is overridden by "auto_from on" in /etc/msmtprc

[toggoboge]

I am running the BackupPC v4.3.1 version of the container.

BTW, below I have obscured my domain as 'mydomain.com'.

$Conf{EMailFromUserName} is overridden by "auto_from on" in /etc/msmtprc, meaning the configured from-address is not used in outgoing emails.

Using SMTP_HOST & SMTP_MAIL_DOMAIN environment variables, I have configured the backuppc container to send emails via a local SMTP relay container (docker pull namshi/smtp).

I've created a Gmail account, mailrelay@mydomain.com, for use by the SMTP relay container. The Gmail account has also been setup with an alias, backuppc-server@mydomain.com, and emails sent by a small python script from this address via my local SMTP relay are successfully received as coming from backuppc-server@mydomain.com.

In the backuppc container, I have set $Conf{EMailFromUserName} to backuppc-server@mydomain.com.

When I try to send a test email to backuppc@mydomain.com from inside the container, I see the following:

bash-5.0$ /usr/local/BackupPC/bin/BackupPC_sendEmail -u backuppc@mydomain.com
Sending test email using /usr/sbin/sendmail -t -f backuppc-server@mydomain.com

This successfully sends emails via my local SMTP relay. However, the mails are always received as coming from mailrelay@mydomain.com.

In spite of backuppc-server@mydomain.com being used on the sendmail command-line, I see the following in the headers:

From: mailrelay@mydomain.com
X-Google-Original-From: backuppc@mydomain.com

Gmail is not honouring the from-address because mailrelay@mydomain.com has permission to send emails from backuppc-server@mydomain.com, but not from backuppc@mydomain.com.

I think this is happening because the "auto_from on" setting in /etc/msmtprc is causing msmtp to generate the from-address from the Linux username, 'backuppc' in this case. This causes the configured $Conf{EMailFromUserName} to be overridden, and backuppc@mydomain.com is used as the from-address instead of backuppc-server@mydomain.com.

Manually changing "auto_from on" to "auto_from off" in /etc/msmtprc has fixed this for me (at least for test emails - I haven't yet checked other emails auto-sent by BackupPC), and the test email sent by the BackupPC_sendEmail command above, is now received by backuppc@mydomain.com with the from-address is correctly set to backuppc-server@mydomain.com.

[toggoboge]

Oh, if you do decide to update entrypoint.sh to address this, it'd be nice to have an environment variable that allows users to enable msmtp logging, perhaps defaulting the logfile to /home/backuppc/msmtp.log if no path is provided. As I was changing it by hand anyhow, I've also modified /etc/msmtprc to include this line:

logfile /home/backuppc/msmtp.log

[adferrand]

Hello @toggoboge! Just to let you know that I saw your issue and did not forgot it. I will handle it as soon as I have some time.

[toggoboge]

Thanks. Maybe /var/log is a better location for a logfile.

[adferrand]

Hello @toggoboge, I finally got the time to handle this issue.

So, I improved the logic to fit the usecase you described here. Basically:

• all logs from msmtp are now stored in /var/log/msmtp.log, and also in supervisord stdout. I hope this will help a lot to debug mail issues
• also, when SMTP_MAIL_DOMAIN is empty (the default), msmtp does not try to rewrite the envelope-from in mails generated by backuppc. So $Conf{EMailFromUserName} will be used, not overwritten. If SMTP_MAIL_DOMAIN is set, the envelope-from will be overwritten to USER@SMTP_MAIL_DOMAIN, like before.

[toggoboge]

Thanks Adrien. Cheer, Brian

…

On Sun, Mar 1, 2020 at 4:56 PM Adrien Ferrand ***@***.***> wrote: Hello @toggoboge <https://github.com/toggoboge>, I finally got the time to handle this issue. So, I improved the logic to fit the usecase you described here. Basically: - all logs from msmtp are now stored in /var/log/msmtp.log, and also in supervisord stdout. I hope this will help a lot to debug mail issues - also, when SMTP_MAIL_DOMAIN is empty (the default), msmtp does not try to rewrite the envelope-from in mails generated by backuppc. So $Conf{EMailFromUserName} will be used, not overwritten. If SMTP_MAIL_DOMAIN is set, the envelope-from will be overwritten to ***@***.***_MAIL_DOMAIN, like before. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#27?email_source=notifications&email_token=AIWUU7FDPICAKRNMWOINLKDRFKHSDA5CNFSM4ISYE4R2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOENNELZQ#issuecomment-593118694>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIWUU7FOM32ZSCYJKKR5BVTRFKHSDANCNFSM4ISYE4RQ> .