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—faq:email09 [2011/04/30 17:09] (current) – created clemens
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 +<code>
 +[09] WHY IS INCOMING EMAIL SOMETIMES DELAYED? WHERE IS MY MAIL?
  
 +     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'.
 +</code>
 +
 +[[email|back]]