Is it possible not to issue RSET at all, because even I truned off AutoSmtpRset, RSET still was issued at the last command. I encountered a very strange anti-spamming server which will detect RSET command.
...... Some Error Session Log....
550 5.7.1 <Return.EID147cda37.Job@mail.xxxxxx.com>... RSET<crlf> 250 2.0.0 Reset state