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Re: spam blocking experiences with MXs
- To: misc_(_at_)_openbsd_(_dot_)_org
- Subject: Re: spam blocking experiences with MXs
- From: "Joseph C. Bender" <benderjc_(_at_)_benderhome_(_dot_)_net>
- Date: Sat, 21 Dec 2002 09:13:58 -0500
At 10:51 AM 12/21/2002 +0100, Robert Waldner wrote:
>On 21 Dec 2002 04:33:10 GMT, "Darren Reed" writes:
>Ok, let's do the math: the average piece of spam, based on what I have
> in my archive, is about 6 kB. Take a few bytes out because of the
> locally generated received:-lines et al, say, it's about 5.800 bytes
>Add to that IP-, TCP- and SMTP-overhead, say, about 1.500 bytes per
>So, delivering the spam instantly would cost you about 7.300 bytes,
> retries every 30 minutes for 5 days amounts to 45 kB or roughly 6
> times as many bytes.
Your math is slightly off.
The MX-bouncer daemon doesn't even get that far. It does a 450 after the
redirect happens in pf. So you'd just be doing the smtp protocol overhead
up to that point.
I do think that Darren's got a point with the retries, but won't most MXen
be configured on a increasing backoff schedule?
I thought Sendmail did that out of the box, so that clueless mail admins
wouldn't have their MXen pounding on other MXen?
benderjc (at) benderhome.net
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