Sendmail writes a /etc/sendmail.pid file with the current process id of the SMTP daemon.
Two people using the same program in their .forward file are considered different so that duplicate elimination doesn't delete one of them.
The mailstats program prints mailer names and gets the location of the sendmail.st file from /etc/sendmail.cf.
Many minor bugs have been fixed, such as handling of backslashes inside of quotes.
A hook (ruleset 5) has been added to allow rewriting of local addresses after aliasing.