msmtp

   1 account net
   2 host mail.martlubbers.net
   3 port 587
   4 auth on
   5 tls on
   6 tls_certcheck off
   7 user mart@martlubbers.net
   8 passwordeval gpg --quiet --batch --use-agent -d ~/passwd.gpg | grep -i mail | awk '{print $3}'
   9 from mart@martlubbers.net