BLD stands for "blacklist daemon" and is intended to serve a blacklist. The blacklist is built by simply inserting IP addresses or by using submission rate limits based on a maximum number of submissions of the same IP address within a minimum time interval. A BLD cluster can be built by configuring the daemon to notify other similar daemon(s) every time an IP address is added to the blacklist. BLD was primarily designed to fight against dictionary-based spam (by making the MTA report to BLD any host that tries to send email to an unknown user), but can be used by any program.
BSD Vacation v2 is a rewrite of the 'vacation' program that has come with Sendmail (and thus *BSD) since about 1983. This version has been almost completely rewritten in an attempt to get it closer to RFC-2822 compliance than any previous version. It properly responds to the correct recipients, as per the RFC, and it correctly handles multi-line headers. The command-line interface is compatible with previous versions, and most recent add-on features from the various *BSD projects have been implemented, such as support for preloading the recent recipients database.
BaGoMa backs up and restores the contents of a GMail account. It can restore all the labels (folder structure), as well as the flags (seen/read, flagged) of a message. It supports the use of any character in labels, including non-ASCII characters and "/" (the label hierarchy delimiter). BaGoMa is tuned to work specifically with GMail. Each message is only downloaded and saved once. Backup solutions that are designed to work with regular IMAP accounts will download each message multiple times (once per label) when used to back up a GMail account. This can significantly increase the bandwidth requirements and the amount of storage required for backup. Additionally, a faithful restoration of your GMail account might not be possible from such a backup.
BackupMX consists of two programs, 'Store' and 'Forward'. Store accepts SMTP connections, takes all mail given to it, and stores it in a file. Forward takes that file and forwards it over SMTP to a fixed destination. This is code for integrating into your own projects rather than using as is. It is suitable for creating a disaster-recovery mail handler, but would also make a good basis for a spam filter, a tarpit, a honeypot, or a greylist filter. It is written in simple C, and has no external dependencies such as libsmtp.
balmail will email a daily report to your boss (or team leader) satisfying their need to quantify your daily technical acheivements. It can be customised to fit your typical list of one line tasks, and will automatically decide which you have done and how many each day. Care has been taken to ensure that the e-mail does not appear to be automated, by varying the time the mail gets sent, the subject lines and the content each day. A holiday feature ensures mail doesn't get sent whilst you are away.