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diff --git a/mail-filter/postwhite/metadata.xml b/mail-filter/postwhite/metadata.xml
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-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE pkgmetadata SYSTEM "">
- <maintainer><email></email></maintainer>
- <longdescription lang="en">
- 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 arthur@dent.tld 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 hitchhike@dent.tld which is delivered to
- the same mailbox. He adds this address to recipients.yml and then
- restarts Postwhite.
- 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 hitchhike+learn@dent.tld 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
- whitelist.
- </longdescription>