Changes between Version 1 and Version 2 of faq/email/greylisting


Ignore:
Timestamp:
Feb 15, 2008, 8:41:54 AM (12 years ago)
Author:
Daniel Kahn Gillmor
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • faq/email/greylisting

    v1 v2  
    1 = Why does it take 20 minutes for a message to get delivered? =
     1= Why does it take 30 minutes for some messages to get delivered? =
    22
    3 May First/People Link uses a technique called "grey listing" to help reduce the amount of spam being sent to our servers. Grey listing means that the first time an email message is sent to our server, our server defers delivery - telling the sending mail server: "Try again later." The next time the sending server tries to send the message, our server accepts it. The reason we do this is because spammers will often not try to re-send after getting deferred the first time.
     3May First/People Link uses a technique called "[WikiPedia:Greylisting greylisting]" to help reduce the amount of spam being sent to our servers. Greylisting means that the first time an email message is sent to our server, our server defers delivery - telling the sending mail server: "Try again later." The next time the sending server tries to send the message, our server accepts it.
    44
    5 Most email servers will resend their message within 15 minutes.
     5Once an email sender/recipient combination has been greylisted once, it will not be greylisted again. So - this step will only happen the first time a sender sends you a message.
    66
    7 Once an email sender/recipient combination has been grey listed once, it will not be grey listed again. So - this step will only happen the first time a sender sends you a message.
     7== Why is this useful? ==
    88
     9Legitimate email servers [RFC:2821#section-4.5.4.1 will resend their message in around 30 minutes]. Most spammers do not run legitimate email servers, and so never retry their spam messages.  This greatly reduces the amount of spam that MF/PL's mail servers need to handle, and means that we can devote a greater proportion of our resources to handling your legitimate mail.
     10
     11
     12