Hello, I though that implicit TLS was evil, (port 465 for SMTP submission was revoked) and STARTTLS encouraged. But I read a new RFC that promotes implicit TLS as a recommended access. https://tools.ietf.org/html/rfc8314#appendix-A Uhm... If I well understood, new SMTP,POP,IMAP services should offer implicit TLS as a favourite TLS negotiation. Anyway I hope that new versions of Perdition could support the STARTTLS/STLS for many years ;) Regards Marco