Greylisting (WAS: gif attachments)

Julian Field mailscanner at
Wed Aug 23 22:37:45 IST 2006

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Daniel Maher wrote:
>> -----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?

There is a well-maintained whitelist of addresses and netblocks you 
should whitelist at

This list (a slightly out-dated version) is included in the 
milter-greylist greylist.conf file. You just need to get the most recent 
version of the file and add it to your greylist.conf once you have 
mangled the syntax of each line appropriately.

Problem solved.

- -- 
Julian Field
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