Thank You for Your time and answer, Patrick: > > and please remove the > > smtpd_banner = The eMail Service > > because it is invalid. The banner must contain the hostname... etc. > > and it must contain "ESMTP" or the client will not know the server can speak > EXTENDED SMTP, which includes the capability "STARTTLS", which is the > startpoint for TLS ... > I've changed it still no luck, on client's side:
[21:35:50] SMTP< 220 The ABC Center ESMTP Service [21:35:50] ESMTP> EHLO localhost [21:35:54] ESMTP< 250-abc.com [21:35:54] ESMTP< 250-PIPELINING [21:35:54] ESMTP< 250-SIZE 30720000 [21:35:54] ESMTP< 250-VRFY [21:35:54] ESMTP< 250-ETRN [21:35:54] ESMTP< 250-AUTH PLAIN LOGIN [21:35:54] ESMTP< 250-AUTH=PLAIN LOGIN [21:35:54] ESMTP< 250-ENHANCEDSTATUSCODES [21:35:54] ESMTP< 250-8BITMIME [21:35:54] ESMTP< 250 DSN [21:35:54] ESMTP> STARTTLS [21:35:55] ESMTP< 502 5.5.1 Error: command not implemented ** error occurred on SMTP session *** Error occurred while sending the message: 502 5.5.1 Error: command not implemented
