Robert Spier wrote:
helo 401 Syntax: HELO hostname
Interesting. Sendmail sends a Permanent error and Postfix send Transient. Reading RFC-2821 again (I'm going to have that memorized soon) suggests that Sendmail is correct this time, from Section 4.2.1:
A rule of thumb to determine whether a reply fits into the 4yz or the 5yz category (see below) is that replies are 4yz if they can be successful if repeated without any change in command form or in properties of the sender or receiver (that is, the command is repeated identically and the receiver does not put up a new implementation.)
I chose 501, FWIW...
John
