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Postwhite is a policy server for Postfix MTA which filters incoming emails
based on per recipient whitelists managed by an email frontend.
Incoming emails are denied unless the sender address or sender domain is
present on the recipient's whitelist. This concept is neither new nor fancy
in itself, but the way Postwhite lets you manage your whitelist sure is.
Here is a real life example:
Arthur's main email address firstname.lastname@example.org is great for everyday
use, but he doesn't want to pollute it by using it for mailing lists,
websites, online shopping and such. Postwhite to the rescue! Arthur creates
a virtual email address email@example.com which is delivered to
the same mailbox. He adds this address to recipients.yml and then
Initially, all incoming emails will be denied, so when Arthur decides to
join the Betelgeuse mailing list, his whitelist has to learn about this.
Arthur sends an empty email to firstname.lastname@example.org which
puts Postwhite into learning mode for a limited period of time. In learning
mode, Postwhite allows and delivers any incoming mails, yet it
delivers a followup notification message along with it. When the first
email from the Betelgeuse mailing list comes in, Arthur simply replies to
the corresponding notification message thus adding Betelgeuse to the