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  1. #1
    Master Untangler
    Join Date
    Mar 2011
    Location
    Auburn, NY
    Posts
    437

    Default Grey listing info

    Per the wiki here is what it says

    Enable greylisting: This option enables greylisting. If enabled, each time a new sender tries to send mail to a specific receiver it will receive a "421 Please try again" error. The second time will mail will be allowed. Greylisting will reduce spam because spammers often won't retry transmissions as they should, or the extra time delay will increase the chances of the spam engine properly identifying new spam waves. However, greylisting adds a delay to all legitimate email. This settings is not suggested for most sites because of the complications.

    In our testing, we see emails being delayed. The issue is, each and every time they are delayed. This seems to happen more often with gmail accounts sending to our domain but we have seen very mixed results. I really like the idea of greylisting and it seems to really be helping in our spam fight.

    I have a few questions.

    1. When we send an email, does the recipent get added to a whitelist for grey listing so it doesn't have to go through the process?

    2. It seems the spam logs within the gui don't show grey listed emails until they finally come through. It would be great if we could see the email being grey listed.

    In our testing from gmail accounts to our domain we have seen everything from the email coming in 15 minutes later to 24+ hours later. We are using the same sender every time. Just trying to get a clearer understanding as the wiki is missing alot of details.

    However, with the latest version its really stomping on our spam and users are reporting a down tick in spam. Great job guys.
    Last edited by AdamB; 01-15-2015 at 12:47 PM.

  2. #2
    Untangler jcoffin's Avatar
    Join Date
    Aug 2008
    Location
    Lake Tahoe
    Posts
    9,686

    Default

    Per the Untangle Spam Blocker wiki link to http://en.wikipedia.org/wiki/Greylisting

    A server employing greylisting deliberately degrades mail service for unknown or suspect sources, over a short period of time. Typically, it records three pieces of data, known as a "triplet", for each incoming mail message:

    The IP address of the connecting host
    The envelope sender address
    The envelope recipient address(es), or just the first of them.
    All three must match on the incoming email several times before the email is not delayed. So in the case of large email providers with thousands of sending IPs, an email address from joe@gmail.com to sue@example.com can be greylisted several times if the email comes with different SMTP IP addresses.

    Which leads to the reasons we don't recommend it for most sites.
    http://en.wikipedia.org/wiki/Greylis...s_consequences
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  3. #3
    Master Untangler
    Join Date
    Mar 2011
    Location
    Auburn, NY
    Posts
    437

    Default

    Quote Originally Posted by jcoffin View Post
    Per the Untangle Spam Blocker wiki link to http://en.wikipedia.org/wiki/Greylisting



    All three must match on the incoming email several times before the email is not delayed. So in the case of large email providers with thousands of sending IPs, an email address from joe@gmail.com to sue@example.com can be greylisted several times if the email comes with different SMTP IP addresses.

    Which leads to the reasons we don't recommend it for most sites.
    http://en.wikipedia.org/wiki/Greylis...s_consequences
    Appreciate the info, makes it a bit clearer.

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