DKIMproxy is an SMTP-proxy that signs and/or verifies emails, using the Mail::DKIM module. It is designed for Postfix, but should work with any mail server. It comprises two separate proxies, an "outbound" proxy for signing outgoing email, and an "inbound" proxy for verifying signatures of incoming email. With Postfix, the proxies can operate as either Before-Queue or After-Queue content filters.
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Dawn will convert your address book from one program's format to another.
This module allows your site's visitors to send private messages to each other.
The Mailhandler module allows registered users to create or edit nodes and comments via email. Authentication is usually based on the From: email address. Users may post taxonomy terms, teasers, and other node parameters using the Commands capability.
