serialmail
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qmail was designed for systems with full-time, high-speed connectivity. serialmail is a set of tools that help adapt qmail to intermittent, low-speed connectivity. With serialmail on such a system, qmail can be configured to deliver all remote mail to a single spool maildir. The serialmail maildirsmtp command can be used to upload the maildir to the Internet Service Provider's (ISPs) mail hub after the connection is brought up. If the ISP supports QMTP (see Chapter 7, "Configuring qmail: Advanced"), maildirqmtp can also be used.
serialmail can be used on the ISP side of a dialup connection to implement the AutoTURN mechanism, where an SMTP connection by a client causes the server to initiate a connection back to the client for delivering messages queued on the server. This is similar to the SMTP ETRN function but doesn't require the client to issue the ETRN command. AutoTURN is documented in the AUTOTURN file in the serialmail source directory.
serialmail was written by Daniel Bernstein, who maintains a Web page for it (http://cr.yp.to/serialmail.html).
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