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Greylisting explained

Discussion in 'E-mail Discussions' started by simon templar, Oct 21, 2015.

  1. simon templar

    simon templar Member

    Mar 28, 2008
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    Hi all,

    From reading the threads, and talking to technical support, I still did not understand how greylisting works. Can someone get into the details ?

    "if an email from an unknown domain comes ": What does make a domain known or not ? And once a domain is known, does it stay known for ever ?

    I understand it is first rejected by my mail server, but when does it get delivered ?

    About the settings:
    Initial deferral period: (default 10 minutes)
    -> Is this how long an email will stay rejected before it gets delivered ?

    Resend acceptance period:
    The information button says "The number of minutes during which the email server accepts a resent email from an unknown triplet" (default 240 minutes) -
    -> What happens when the same email is sent within this period of time, but before the 10 minutes above. Does it reset a counter ?
    -> What happens when the same email is sent within this period of time, but after the 10 minutes above ?

    Record expiration time (default 4320 minutes)
    What does this do ?

    If you know your way around, can you give a typical scenario ?

    If I look at my greylist reports, I have
    email from:
    email to: yyy.yy
    Deferred: 3
    Accepted 5
    Create time: A day ago
    Block expire time: A day ago
    Must retry time: 20 hours ago
    Record expire time: in 2 days

    Did this email get delivered or not ?
    If not, when will it be ?

    Thank you all !
  2. cPanelMichael

    cPanelMichael Forums Analyst
    Staff Member

    Apr 11, 2011
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    Root Administrator

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