Fix validity of the FROM email address not being checked (#29347) (#29360)
Backport #29347 by @carlosfelgueiras
Fixes #27188.
Introduces a check on the installation that tries to parse the FROM
address. If it fails, shows a new error message to the user.
Co-authored-by: Carlos Felgueiras <carlosfelgueiras@tecnico.ulisboa.pt>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Giteabot