postfix-users May 2014 archive
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postfix-users: Re: Selective greylisting

Re: Selective greylisting

From: D'Arcy J.M. Cain <darcy_at_nospam>
Date: Wed May 14 2014 - 12:28:50 GMT
To: Matt Holgate <matt@holgate.org.uk>

On Wed, 14 May 2014 11:13:20 +0100
Matt Holgate <matt@holgate.org.uk> wrote:
> I was wondering if greylisting would be a useful thing to try in an
> attempt to reduce the amount received?

Greylisting is great. The day that I implemented it I saw a 90%
reduction in spam. Don't hesitate.

> Problem is, I don't really like greylisting in general, because of
> the delays it adds to incoming mail.

It's really minimal and it only adds the delay to the first message
between users. I never get complaints about the delay.

> One downside is that I guess the entire email needs to received and

This is a huge downside especially with the size of some of these
attachments. If you can block it before it fills your pipe you soften
any effect that the greylisting delay adds.

Don't forget about postscreen as well. It's easy to apply and does a
great job.

-- D'Arcy J.M. Cain System Administrator, Vex.Net http://www.Vex.Net/ IM:darcy_at_Vex.Net VoIP: sip:darcy@Vex.Net