[wplug-internet] Postfix greylisting

Ted Rodgers ted.d.rodgers at gmail.com
Thu Mar 29 23:23:39 EDT 2012


On Thu, Mar 29, 2012 at 11:01 PM, Pat Barron <pat at lectroid.com> wrote:

> Every once in a while, I'll try to send a message to one of the WPLUG
> mailing list, and it will fail temporarily with an error like this:
>
> Deferred: 450 4.2.0 <wplug at wplug.org>: Recipient address rejected:
> Greylisted,
> see http://postgrey.schweikert.ch/help/wplug.org.html
>
> Usually, if I just manually re-run the queue (sendmail -q -v), or just
> wait for it to happen automatically after the queue run interval passes,
> it'll succeed the second time.
>
> Can anyone explain this behavior?  I'm just not familiar with postgrey
> or how it works.
>
> Greylist protects against spam mail.  When a mail is sent from a domain,
the sending server gets a "try again later" response and has to retry after
the "greylist" timeout period expires.  Once the sending mail server
complies (and if it's RFC compliant to know what the try again message is),
the mail will be delivered.


> --Pat.
> _______________________________________________
> wplug-internet mailing list
> wplug-internet at wplug.org
> http://www.wplug.org/mailman/listinfo/wplug-internet
>
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