Hi there,I'm running an OSTicket v. 1.10.1 on a Ubuntu 16.04 server, with php 7.0.28.I have troubles sending email with SMTP with a single address (the other twelve, from a different domain, work perfectly), googled a couple of days, already substituted PEAR packages (Net_SMTP, Net_Socket) and tried 'tls://', 'ssl://' prefixes/ports in connection settings for the SMTP server. For this server (which I have no control of) of course I need authentication, but connection to 587 with authentication get refused with error:authentication failure If I telnet from OST server, connection to mail server's port 587 works fine.My email service provider doesn't allow port 25, answered he can't deal with OST problems with STARTTLS/self signed certificates and that I should simply disable starttls.Is this my best shot? If it is, how do I'd do that?Cheers,Filippo