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librfc822 provides application developers with a complete parser for RFC822 addresses. Not only can you use the library to verify that RFC822 addresses are syntactically correct, you can also have an address split up into its semantic parts, what is needed when deciding where to route an address to, etc. What is quite unique is that librfc822 does indeed parse all address types allowed by the standard. That includes such weird things as "address groups" or addresses with whitespace and comments throw in.

libSieve provides a library to interpret Sieve scripts, and to execute those scripts over a given set of messages. The return codes from the libSieve functions let your program know how to handle the message, and then it's up to you to make it so. libSieve makes no attempt to have knowledge of how SMTP, IMAP, or anything else work; just how to parse and deal with a buffer full of emails. The rest is up to you!

The Kaspersky Antispam 3.0 software is a efficient anti-spam solution. It uses sophisticated methods to fight spam with very low false positive rate. Client software for various MTA is provided. This package installs hand compiled spamtest library.

libspf2 implements the Sender Policy Framework, a part of the SPF/SRS protocol pair. libspf2 is a library which allows email systems such as Sendmail, Postfix, Exim, Zmailer and MS Exchange to check SPF records and make sure that the email is authorized by the domain name that it is coming from. This prevents email forgery, commonly used by spammers, scammers and email viruses/worms.

libsrs2 is the next generation SRS library from the original designer of SRS. It implements the Sender Rewriting Scheme, a part of the SPF/SRS protocol pair.

libvmime is a MIME manipulation library.

Mailgraph is a very simple mail statistics RRDtool frontend for Postfix that produces daily, weekly, monthly and yearly graphs of received/sent and bounced/rejected mail.

Sendmail implements a general purpose internetwork mail routing facility under the UNIX operating system. It is not tied to any one transport protocol - its function may be likened to a crossbar switch, relaying messages from one domain into another. In the process, it can do a limited amount of message header editing to put the message into a format that is appropriate for the receiving domain. All of this is done under the control of a configuration file. Sendmail is a trademark of Sendmail, Inc.

mboxstats creates several top-10 lists from a file containing message in mbox-format. List of top10 lists: o Top writes o Top receivers o Top subjects o Top cc'ers o Top top-level-domain o Top timezones o Top organisations o Top useragents (mailprograms) o Top month/day-of-month/day-of-week/hour o Average number of lines per message o All kinds of per-user statistics And much more!

mboxgrep is a small utility that scans a mailbox for messages matching a regular expression. Found messages can be either displayed on standard output, counted, deleted, piped to a shell command or written to another mailbox. Its features include: * ability to limit the search to message body or headers (although the whole message is scanned by default) * message counting * ability to invert the sense of matching * ability to write found messages to another mailbox * support for mbox (either plain or compressed), MH, nnmh, nnml and maildir folders * support for basic and extended POSIX regular expressions, and, optionally, Perl-complatible regular expressions (if linked with the PCRE library)