Today I tried to configure the sender for sendmail in php. There are some ways how to do it, so I share my solution.
There is a
sendmail_from setting in php cli and php fpm, but it is usually empty. So sendmail fallsback to
user@hostname (given you are logged in as
user and the machine is called
But I found a better way (maybe even easier to extend). Just change the
sendmail_path to something with an extra
-f email@example.com at the end.