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https://support.gfi.com/hc/en-us/articles/360012875994-How-does-greylisting-work-
Nov 30, 2018 · The whitelisting remains in place for upwards of a month. After a message passes through the greylisting, that message is processed as usual, so that any spam message that is retried will still be subjected to the same message analysis techniques as in cases where greylisting is not used. Impact on Mail Flow:
https://support.threattracksecurity.com/support/solutions/articles/1000070643-what-is-greylisting-and-how-does-it-work-
Jul 12, 2017 · What is Greylisting? Greylisting is a powerful Anti-Spam technology that is used to detect if the sending server of a message is RFC compliant. This is done through temporarily blocking unknown senders and caching details of the initial message. ...
https://support.appliedi.net/kb/what-is-greylisting/
Nov 11, 2019 · Greylisting (sometimes spelled graylisting) is a method of defending email users against spam. Greylisting dramatically reduces spam by making it wait to be received by the server. When an email message arrives at the SmarterMail server from an unfamiliar host or domain, the greylisting function refuses the message for a period of 15 minutes.
https://www.sonicwall.com/support/knowledge-base/what-is-greylisting/170504923537915/
Some greylisting packages support an SQL backend which allows for a distributed multiple-server frontend to be deployed with the same greylisting data on all frontends. Disadvantages Perhaps the most significant disadvantage of greylisting is the fact that, like some other spam mitigation techniques, it destroys the near-instantaneous nature of ...
https://www.noip.com/support/knowledgebase/what-is-greylisting/
Greylisting relies on the fact that most spam and viruses only try to deliver the message once.Greylisting temporarily denies the first attempt, telling the spammer to try again (450 Please try again later.) On the next attempt the message is accepted. If a mail server passes this test enough times it is added to a whitelist so it does not have to pass the greylisting test again.
http://www.tldp.org/HOWTO/Spam-Filtering-for-MX/exim-greylisting.html
Adding Greylisting Support There are several alternate greylisting implementations available for Exim. Here we will cover a couple of these. A.6.1. greylistd This is a Python implementation developed by yours truly. (So naturally, this is the ...
https://answers.microsoft.com/en-us/msoffice/forum/all/how-to-prevent-greylisting/c0999c64-8c39-460d-9433-77f2c5a29894
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https://community.cisco.com/t5/email-security/greylisting-support/td-p/824177
Oct 12, 2007 · Re: Greylisting support We I wouldn't call it like this, but this is just a technologies that will not work for large ISPs or enterprises. If you think of a IronPort X1050 that juggels 4k Message per minutes having those to hold in the queue for 5 minutes more makes 20k message, just because some systems do this greylisting.
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