[issue19679] smtpd.py (SMTPChannel): get rid of "conn" attribute

[Leslie P. Polzer]

Leslie P. Polzer added the comment:

The contents of "conn" are already stored by asyncore's "socket" attribute, so there doesn't seem to be a need to keep it around. We should deprecate its usage and refer the user to the "socket" attribute.

Furthermore I suggest renaming the "conn" argument to "socket" to make its semantics clearer.

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title: smtpd.py: implement ESMTP status messages -> smtpd.py (SMTPChannel): get rid of "conn" attribute

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