RBL & greylisting on Ubuntu.com smtp

[Lionel Dricot]

This is, AFAIK, the default postgrey behaviour in Debian. There's also
a long list of whitelisted smtps known to have a slow retry rate.

But spammers are getting better every day. They often retry to avoid
greylisting and they don't put fake outlook header and so on.

In facts, on my ubuntu address, I receive everyday 10-15 spams that
have a 0.0 score with spamassassin ! SA doesn't detect anything at all
with those spams ! Weird :-(

On 6/20/06, Tollef Fog Heen <tfheen at canonical.com> wrote:
> * Scott Dier
>
> | I've seen mails be delayed by 12 hours or more due to greylisting
> | and address verification combined with lamely configured mail MX
> | clusters. (if you don't share the greylist between a setup of 5 MX
> | servers, you shall configure it, now. really.)
>
> Which is why greylisting on the /24 netblock instead of the exact ip
> address usually is a good choice.  Most mail server farms seem to live
> on the same subnet.
>
> --
> Tollef Fog Heen                                                        ,''`.
> UNIX is user friendly, it's just picky about who its friends are      : :' :
>                                                                       `. `'
>                                                                         `-
>
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