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faq:email09 [2011/04/30 17:09] (current)
clemens created
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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]]