These options specify whether or not a channel supports the SMTP
protocol and what type of SMTP line terminator PMDF expects to see as
part of that protocol.
nosmtp means that the channel
doesn't support SMTP; all the rest of these keywords imply SMTP support.
The selection of whether or not to use the SMTP protocol is implicit for most channels; the correct protocol is chosen by the use of the appropriate channel program or programs.
smtp is mandatory for all SMTP channels.
smtp_lf may be used on SMTP
channels to specify what character sequences to accept as line
smtp_crlf means that lines must be terminated
with a carriage return (CR) line feed (LF) sequence.
smtp means that lines may be
terminated with any of a carriage return (CR), or a line feed (LF)
sequence, or a full CRLF.
smtp_lf means that a LF without
a preceeding CR will be accepted. Finally,
that a CR will be accepted without a following LF. It is normal to use
CRLF sequences as the SMTP line terminator, and this is what PMDF
itself always generates; this option only affects PMDF's handling of