[nzlug] (OT) Sorbs etc, was Exim: Limiting outgoing connections on Debian

[Matt Brown]

Simon Lyall wrote:

> a. The above downsides *do* exist.
> b. Greylisting imposes load on the mail servers of senders.
> c. Greylisting is fairly simple for Spammers to beat and they will beat it
>    when it becomes worthwhile.

The best suggestion I've heard so far relating to grey listing is to
only greylist when you already suspect a sender of being "dodgy".

ie.

if sender in RBL or fails reverse lookup => greylist
else => straight to spam filtering

Particularly if you use a dial-up RBL then you can get many of the
benefits of greylisting while hopefully avoiding it's use (and
disadvantages) for many hosts that you commonly receive legitimate mail
from.

--
Matt Brown
matt at mattb.net.nz
Mob +64 21 611 544 www.mattb.net.nz

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 191 bytes
Desc: OpenPGP digital signature
Url : http://www.linux.net.nz/pipermail/nzlug/attachments/20061011/a1de26e8/signature.pgp