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- extsmail enables the robust sending of e-mail to external commands. In
- effect extsmail masquerades as the standard UNIX sendmail program, reading
- messages, and later trying to send them by user-defined commands. A typical
- use of extsmail is to allow users who regularly move between different
- networks and / or find themselves regularly offline, to ensure that their
- e-mail is sent reliably via ssh to external servers.
- In addition to its main purpose, extsmail also allows priority lists to be
- defined, and also for e-mails to be routed to different servers depending on
- the e-mail content. The former feature allows one to designate a "preferred"
- server to send e-mail, but to use a "backup" server if the preferred server
- is down. The latter feature allows e-mails sent to different e-mail
- addresses, for example, to be routed to different servers; this allows
- e-mails to adhere to the IP addressed filtering increasingly used to cut
- down on spam.
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