What we found on the web about Greylisting
Greylisting (or graylisting) is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it ...
Greylisting: this forces email to be delayed for a configurable period, requiring the remote end to resend mail at least once in order for it to be delivered.
Greylisting (or graylisting) is a new anti-spam measure implemented on email servers. It's starting to become more widespread, and if you don't run your own email server, your ...
greylisting. A spam prevention method in which the receiving mail server rejects a message the first time it is received. The sending server of a legitimate user will eventually ...
Not everyone wants greylisting. It is extremely efficient against spam, but it introduces a delay in legitimate mail delivery. Users that currently receive no spam ...
Postgrey - Postfix Greylisting Policy Server. Postgrey is a Postfix policy server implementing greylisting developed by David Schweikert. Development of Postgrey started at the ISG ...
SQLgrey Sourceforge project page What is SQLgrey ? SQLgrey is a postfix policy service implementing a grey-listing policy. SQLgrey is written in Perl and uses DBI to access an SQL ...
greylisting. A spam prevention method in which the receiving mail server rejects a message the first time it is received. The sending server of a legitimate user will eventually ...
For quite some time, I've wanted to implement greylisting on my mail servers. But, to be honest, every time I looked at the greylisting howtos, they just made me feel stupid.
A friend of mine is all excited about some new form of spam control he calls "greylisting". He tried to describe it to me, but just got me more confused.
Greylisting relies on the inherent reliability built into the SMTP protocol - basically, you can temporarily reject a message and be reasonably confident that the sending MTA will ...
Greylisting seems to be the right method to effectively lower the spam levels your mail servers get daily. Read more about it on my Combating Spam with
CT have just sent out notifications that some of the shared email servers will have Greylisting enabled on Monday 16th April. Greylisting will be of great benefit to CT users.
Here is what users have to say about Greylisting

Greylisting (or graylisting) is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will, after a delay, try again and if sufficient time has elapsed, the email will be accepted. If the mail is from a spammer it will probably not be retried since a spammer goes through thousands of email addresses and typically cannot afford the time delay to retry.

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