Sthu Pous:
> 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

Anti-virus software is known to do these things, because it would
not be able to decrypt the traffic. The software may be running on
the client, on the server, or on a firewall.

        Wietse

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