[ SDF Public Access UNIX System .. Est. 1987 ]

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     SDF has used UUCP (UNIX to UNIX CoPy) to transfer both incoming
     and outgoing mail since the late 1980s.  This is referred to as
     a 'Store and Forward' method, so it is not always instantaneous.

     SDF does receive email directly using SMTP, but at the same
     time also uses a secondary host which queues up email via UUCP
     for pick up each hour via 'uucico' using the 't' protocol.  The
     result: sometimes you get your mail in a few seconds, sometimes
     you have to wait a bit.  This also means that if for some reason
     the primary SMTP server at SDF is down, offline for maintenance
     or on fire, email will still be written to an SDF UUCP queue for
     future delivery rather than sit waiting in a foreign outbound
     SMTP queue where it may be deleted or returned.

     All SDF hosted email domains use the SMTP primary and UUCP secondary
     MX (Mail eXchanger) method with the except of VHOSTed domains which
     have the option to use the UUCP secondary via 'mkvhost'.


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