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ESMTP header (Hdr220)

Just a note.

To start ESMTP session, some clients (i.e., Postfix) want to see
"ESMTP" word in 220 initial server reply.

In case of two-string reply, like Zmailer-'51 default config, the 
results seems to be unpredictable. I.e., same Postfix says EHLO if 
ESMTP is present in _second_ line. So, the default "smtpserver.conf" 
with uncommented Hdr220 parameters forces plain SMTP session - 
without TLS, etc.

The advice is to have "ESMTP" in ALL initial strings... or just to 
have a single 220 string :-)