[SWLUG] QMail recipient check

[Daniel Barbato]

Hi Guys,

I'm having a similar problem to Foeh, except in this case I have a
catch all address [1]. Unfortunately the evil spammers have started
faking from addresses, they are generally gobbledy-gook,
wetsdgerg at test.com for instance, and they are very rarely the same.

This doesn't really bother me or affect me. What does bother me is the
number of bounced mails I get back stating that :

An address doesn't exist,
A mail box is full,
The user is using spam protection, if you did send this mail please
verify it by clicking this link. [2]
Out of office replies
...

you get the idea.

Unfortunately because they are all bounce back, they are mostly all
from unique IP addresses and individual users, making it very
difficult to stop.

I was wondering if anyone had any ideas on how it could be stopped.

For instance I remember hearing something about hosting on my domain
which states the valid ip addresses that mail from my domain can be
sent from, the receiving MTA checks the ip, if it's not valid it
throws it away.

Any ideas or suggestions welcome.

Cheers

Daniel

[1] This is useful for email addresses for individual companies, for
instance if I were to sign up at dabs, they'd get dabs at test.com. It
may also be interesting to note that most companies don't sell your
address on if it's their_name at test.com, but on a few occasions, either
where I've signed up multiple times, or used a different name but
still unique to them, the address that doesn't have the domain name in
it has been sold on. B*st*rds, some of these are large popular
companies too.

[2] I class this as the most annoying form of spam!

On 9/5/06, Andy Dixon <andy at andydixon.com> wrote:
> Foeh Mannay wrote:
> > Hi,
> >
> > I'm being plagued by bounced bounces at the moment. Some spammer guessed
> > one of the aliases I use for mail on my domain, so I deleted the alias
> > but now I keep getting messages from qmail saying it tried to send a
> > bounce for something arriving on the deleted adress (100% spam) but the
> > bounce bounced.
> Hi,
>
> in your /etc/mail/virtusertable you need to add:
>
> test at example.com        error:nouser error message
>
> where test at example.com is the email address the spammer has and 'error
> message' is the error message you want to send.
>
> HTH
>
> Andy
>
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