Re: [courier-users] sender verify callout vs. tarpit

This is a multi-part message in MIME format.
--------------090203000703040105020806
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Marcus Ilgner wrote:
> could maybe someone point me to some documentation on the tarpit
> functionality in the Courier MTA?
I don't think there's much on the website... The mailing list archives
and the C code (courier/module.esmtp/couriesmtpd.c around line 65 is a
start) will have to suffice...

> What options there are possibly to set,
There aren't any options to be set (though I'd love to have the ability
to configure the timeout lengths and have a whitelist... hint, hint...).

You could play with the hard coded INIT_TEERGRUBE and MAX_TEERGRUBE
definitions and recompile... Setting INIT_TEERGRUBE to 0 should
effectively disable the tarpit. Bumping MAX_TEERGRUBE to high would
likely result in ESMTP connections timing out (possibly from a legit
connection that just has a bunch of old email addresses...)
> how it determines the address to tarpit etc.
As I understand it, it's not based on address, it's based on the server
response. For example, if I connect and start sending bad commands, I
start getting tarpitted. If I send a rcpt to: and Courier responds that
it's non-existant, I start getting tarpitted... The timeout length
continues until it hits MAX_TEERGRUBE. These settings are per session
as I understand, so that if the same IP connects later (or even at the
same time), one connections bad behavior will not cause the other to be
tarpitted.
> Up to now the
> existence of that functionality was the only thing that I could find
> ;)
>
Yep, this does need a little more documentation. Especially since it
can really break things like Backup MX servers (yes I know they're a bad
idea nowadays anyways but that doesn't mean they're going away)...

Jay

--------------090203000703040105020806
Content-Type: text/x-vcard; charset=utf-8;
name="jlee.vcf"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename="jlee.vcf"

begin:vcard
fn:Jay Lee
n:Lee;Jay
org:Philadelphia Biblical University
email;internet:jlee@pbu.edu
x-mozilla-html:TRUE
url:http://www.pbu.edu
version:2.1
end:vcard


--------------090203000703040105020806
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys -- and earn cash
http://www.techsay.com/default.php?p...rge&CID=DEVDEV
--------------090203000703040105020806
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
courier-users mailing list
courier-users@lists.sourceforge.net
Unsubscribe: https://lists.sourceforge.net/lists/.../courier-users

--------------090203000703040105020806--