This is equivalent to revocation in our case.

We need to rotate it

Having them unquoted is possibly insecure. Also, it kept losing newlines
in the messages.

Not all servers support login, and some support better. Use the best one
available.

Always sent, but used only in testing purposes.

Using == as test condition is bashism. While ash is willing to swallow
that, there are shells that aren't.

* Directory to operate on
* Flag to trigger sending right away

mail_notifier: Disabled multiple tries to send message. Messages are marked with stamp even if smtp server is not configured.

mail_notifier: Check for enabled smtp right before msmtp call and do not exit if smtp is not configured.