Sendmail is a very popular unix Mail Transfer Agent, a program that moves mail from one machine to another.
Changes: This version fixes a long-standing MIME (7 to 8-bit) conversion bug, a possible communication problem between the MTA and libmilter, bug in handling (invalid) addresses containing 8-bit characters, a possible problem with small timeouts being lost on slow machines if itimers are used, and handling of the 421 reply code and timeouts in the SMTP delivery code.