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05-17-2004 05:19 PM
05-17-2004 05:19 PM
Spoof Mail 2
Can you help me? Another problem of mine is, how can I block a mail that comes from a valid domain but uses an invalid user address no such account in the organization mail server)?
Regards,
LAT
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05-17-2004 05:34 PM
05-17-2004 05:34 PM
Re: Spoof Mail 2
From:spammer@some.dom REJECT
then restart the sendmail service
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05-17-2004 06:41 PM
05-17-2004 06:41 PM
Re: Spoof Mail 2
Thanks for the reply but what I need is the spoofer is automatically blocked.
Regards,
LAT
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05-17-2004 07:16 PM
05-17-2004 07:16 PM
Re: Spoof Mail 2
It has it's database (updated automatically).
Neverless I had to add to this database many e-mail addresses manually.
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05-18-2004 09:39 AM
05-18-2004 09:39 AM
Re: Spoof Mail 2
Most sites disable this (and should) as it allows would-be attackers to verify account existance before attempting to exploit.
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05-18-2004 02:02 PM
05-18-2004 02:02 PM
Re: Spoof Mail 2
To Alexander:
Thanks for the info. but actually we also have same antivirus system. Aside from manual feeding of spoof mail, I am looking for any other way to do it automatically (though other say there's no way).
To Lee:
I think it is not good to enable it. See http://www.burningvoid.com/iaq/expn-vrfy.html. It is security risk.
Regards,
LAT
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05-18-2004 03:25 PM
05-18-2004 03:25 PM
Re: Spoof Mail 2
Reason: would you let some computer on the other side of the world send out inquiries as to whether an email address is valid on your server or not?
No. As a matter of fact good sendmail administration requires us to specifically block those kind of inquiries because spammers and script kiddies use them to validate email addresses.
The best thing you can do is batton down the hatches, as you have done, maybe fire up spamassasin and teach your users how to not attract spam.
The biggest drop in spam I made happen was when I scoured my own webservers for email addresses. When I got those, the spam stopped flowing in.
Spammers aren't necessarily the smartest people in the world. As a matter of fact, many of them are quite stupid. If you deny them the obvious ways of getting email addresses, they'll go elsewhere.
SEP
Owner of ISN Corporation
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