Fighting SPAM

[mcorbett]

Hello,

Have any Exchange 2003 mail admins out there had any luck blocking spam by somehow blocking all messages whose sending mail hosts do not resolve correctly to a reverse DNS query? If so, can this technique be done with the Windows 2000 virtual SMTP server, or are you using a third party software solution? I was thinking of setting up a second host and installing the Microsoft SMTP service receive mail from the internet and forward on to our Exchange 2003 server. This bridgehead server would theoretically be doing the reverse DNS blocking. Thanks for your help!

-Matt Corbett

 

[cismbear]

I have successfully been able to block almost all spam by implementing Intelligent Message Filter. Here is a great link

http://www.petri.co.il/block_spam_with_exchange2003_imf.htm

Maybe not the answer you were looking for, but it may help.

 

[sdgman500]

Does Exchange IMF work any better than the filter policies within Symantec Mail Security for Microsoft Exchange 4.5??

 

[TruBlu01]

We use Postini, it pretty cheap and we get absolutly no spam anymore.

 

[forbsy]

We have a Postfix box at our gateway that among other things checks reverse DNS for incoming connections. If no reverse is found then the connection is dropped, and that mail never reaches our Exchange box.

Forbsy

 

[Zelandakh]

Stick Gfi mail essentials on. Trial version carries on anti spamming after trial period. By design.