I wrote a Python application addrcollector for collecting email addresses from email messages. Addresses can be added by sending a message on standard input or my adding on the command line. Addresses can be retrieved by using a keyword. Old addresses are automatically purged. See the usage output below.
addrcollector: Collect email addresses for later retrieval, or
search the database of previously collected addresses.
Usage:
addrcollector.py --add ADDRESS [NAME]
addrcollector.py --import
addrcollector.py --search WORD...
addrcollector.py --help
Options, arguments, and commands:
-a --add Manually add an address.
ADDRESS Email address to add to database.
NAME Name to associate with email address (optional).
-i --import Import addresses from headers of one message via standard input.
-s --search Search database for addresses; multiple keys are ORed.
WORD Search key.
-h --help Usage help. Requires: python3-docopt, python3-xdg