This package supplies batch SMTP support for sendmail, both incoming
and outgoing.  Batch SMTP can be used to batch and compress mail
messages for UUCP links, which is faster and doesn't suffer from
the address limitations of rmail.  Bsmtp's version of batch SMTP
is fully compatible with smail.

WWW: http://www.stud.uni-karlsruhe.de/~uk1o/bsmtp/