Greylisting (WAS: gif attachments)

Jeff A. Earickson jaearick at
Wed Aug 23 22:07:33 IST 2006

On Wed, 23 Aug 2006, Daniel Maher wrote:

> Date: Wed, 23 Aug 2006 17:02:06 -0400
> From: Daniel Maher <daniel.maher at>
> Reply-To: MailScanner discussion <mailscanner at>
> To: MailScanner discussion <mailscanner at>
> Subject: RE: Greylisting (WAS: gif attachments)
>> -----Original Message-----
>> From: mailscanner-bounces at [mailto:mailscanner-
>> bounces at] On Behalf Of Julian Field
>> Sent: August 23, 2006 4:29 PM
>> To: MailScanner discussion
>> Subject: Re: gif attachments
>> Try implementing greylisting on your servers. This has helped a lot with
>> this problem on my systems.
>> Even if you set the greylisting delay as low as 5 minutes.
> My big fear w/ Greylisting is that a (legitmate) SMTP server somewhere won't respect the "try again later" code, and instead just fail to deliver the mail.  I've heard rumours that some of the larger webmail providers exhibit this behaviour.
> Comments?

That is like running a red light and then complaining about the accident.
I doubt most email sysadmins would give the complainer much sympathy.

Jeff Earickson
Colby College

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