[Koha] Sending mail via external smtp server auth

Hi All, this is my first mail to this wonderful mailing list. I read every day your messages since 3 months. A simple question about mail sending. Did anyone find a simple solution to send mails using an external smtp server with auth. I successfully upgraded sendmail to 0.79_16 and I can successfully process the holds configuring username and password. But for the other communication is not so simple, has anyone some ideas? Thanks a lot to everyone! Alessio Ruzza Biblioteca Isola di Libri Milano - Italy http://libri.nuovaacropoli.org/