Add email support (GH-23)

[eoehen]

• Add support to send mail after backup is executed.
• Add log volume for test or dev environment.
• Successfully tested with PaperCut

Extracted from PR #25 by @pfeigl

[eoehen]

@pfeigl My tests dosn't send any emails. Do you have an idea why?

[pfeigl]

I also had some problems. What you can do is the following:

• run the mail command interactively and see if it shows any errors
• Either enable the msmtp logfile (logfile /var/log/msmtp.log) or install rsyslog, start the service and set syslog on in msmtp config.

[pfeigl]

Btw, you can use this to also get mail stdout and stderr into the cronlog echo "$cronSchedule . /container_env.sh; /usr/local/bin/backup.sh 2>&1 | tee -a /var/log/cron.log | mail -s 'SQL Server Backup Result' $MAIL_TO 2>&1 | tee -a /var/log/cron.log"

[pfeigl]

The -a (append) is important, I missed them in my initial version - this would truncate the cron.log over and over again.

[eoehen]

The -a (append) is important, I missed them in my initial version - this would truncate the cron.log over and over again.

Thank you for your input, it was helpful to find the problem. But I am not sure if we should use the append parameter (-a). I think in this case we should have the control about the growing of the logfile.

I create a new Issue for this #39

[eoehen]

@pfeigl My tests dosn't send any emails. Do you have an idea why?

Now I could test it with PaperCut Without TLS and AUTH.

[pfeigl]

Great. I tried with mailtrap and office365 servers and both worked great (also with tls and auth).