RFC 1123 Compliance

A number of changes have been made to make sendmail conditionally compliant (that is, sendmail satisfies all of the MUST clauses and most but not all of the SHOULD clauses in RFC 1123).

The major areas of change are (numbers are RFC 1123 section numbers):

5.2.7
Response to RCPT command is fast.
5.2.8
Numeric IP addresses are logged in Received: lines.
5.2.17
Self domain literal is properly handled.
5.3.2
Better control over individual timeouts.
5.3.3
Error messages are sent as From:<>.
5.3.3
Error messages are never sent to <>.
5.3.3
Route-addrs are pruned.

The areas in which sendmail is not unconditionally compliant are:

5.2.6
Sendmail does do header munging.
5.2.10
Sendmail doesn't always use the exact SMTP message text as listed in RFC 821.
5.3.1.1
Sendmail doesn't guarantee only one connect for each host in queue runs.
5.3.1.1
Sendmail doesn't always provide adequate concurrency limits.


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