Linux.com: Automatically Add Contacts to KAddressBook with KBBDB

“Managing your address book and appending new addresses can get
tiresome. If your email client is KMail, KBBDB can help with part
of the job. This Perl-based filter sits idle waiting for messages
to show up, then extracts any new sender’s email address into
KAddressBook.

“The utility is inspired by the Insidious Big Brother Database
(BBDB), which is a contact management utility for Emacs. If you use
[X]Emacs as an email client, BBDB can watch incoming messages, and
whenever a new email address is spotted, it automatically adds it
to the contact list, maintained in its own database…”

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