Sender ID Filtering in SP2 (Full Version)

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machoman013 -> Sender ID Filtering in SP2 (3.Nov.2005 12:20:47 PM)

I was reading this article:

http://www.msexchange.org/tutorials/Configuring-enabling-Sender-ID-filtering-Exchange-2003-SP2.html

But, I'm a little confused. So if I turn the filtering on, will it reject ALL incomming email from servers without SPF in their DNS entries?

P.S. Where can I get the hotfix?
http://support.microsoft.com/?kbid=905214

I can't find any download areas.



Maltliqher56 -> RE: Sender ID Filtering in SP2 (9.Nov.2005 5:03:03 PM)

That is a good question above, I was wondering the same thing, and also what is the overhead of a server performing this "lookup" for every piece of mail? Does the DNS server cache the results for a specific domain and refresh them every so offten? Please answer the previous question and mine if possible.
 
Thanks
 
Brandon



machoman013 -> RE: Sender ID Filtering in SP2 (9.Nov.2005 5:13:03 PM)

I emailed he author of the article, it won't reject servers without SPF entries, it'll just reject deemed "spoofed" email in 3 ways. As for the DNS overhead, I put it on and didn't notice much of anything on my servers. Tar Pitting might be a slight overhead but then again I don't have thousands of computers to manage.



Maltliqher56 -> RE: Sender ID Filtering in SP2 (9.Nov.2005 5:19:24 PM)

Thanks for the quick reply! My site is about 600+ users with remote locations emailing quite frequently, is your site comparable? Just trying to see what the total overhead is going to be for the DNS servers.

Thanks again,

Brandon



machoman013 -> RE: Sender ID Filtering in SP2 (9.Nov.2005 5:25:52 PM)

I'm with a small company, only 70 users; but they are also emailing quite frequently, it's their primary means of communication for the whole day



consultOz -> RE: Sender ID Filtering in SP2 (9.Nov.2005 9:23:45 PM)

hey guys while I was reading about sender ID here what I found, and I would like to share with you.

Sender ID works by providing out-of-band notification of what IP addresses are authorized to originate email for each domain. So what the spammers have done is sign up for $5 domains, published saying that their machines are authorized, and then they send away."
http://blogs.msdn.com/alexbarn/archive/2004/09/11/228202.aspx


Cheers,
oz



machoman013 -> RE: Sender ID Filtering in SP2 (9.Nov.2005 9:25:45 PM)

That's terrible. So it would be to tell the server to not produce an NDR and just accept and delete to help with this?



Maltliqher56 -> RE: Sender ID Filtering in SP2 (15.Nov.2005 9:40:30 PM)

From the same article...
 
"Meng Weng Wong (co-authored of both the SPF and Sender ID standards) argues SPF nor Sender ID was never intended to stop spam:

"The technology is merely a way to stop one loophole spammers use: source address spoofing. Evidence that spammers are publishing SPF records is a good sign...
Spammers are buying into a future that will wipe them out...
In theory, when all spammers are forced to publish SPF records, along with all legitimate e-mail senders, it will be easy for legitimate companies to develop e-mail reputations for Internet domains that do and do not send spam"
 
 




anihimous -> RE: Sender ID Filtering in SP2 (13.Jan.2006 9:39:44 AM)

I have 2 servers

ISA server 2004 with 2 nics with one connected to the internet
Exchange 2003 SP2 behind the ISA and published via publishing rules fot SMTP and pop3
Sender ID is not stamped in the incoming messages.

Any ideas?



justbasit -> RE: Sender ID Filtering in SP2 (14.Aug.2008 9:53:06 AM)

how did you configure Exchange 2003 behind  the ISA 2004 and published via publishing rules SMTP and pop3? can you please tell me the mothed, also can users access their email accounts via OWA from outside the organization?

thanks in advance.



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