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Sender ID Filtering in SP2

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Sender ID Filtering in SP2 - 3.Nov.2005 12:20:47 PM

machoman013

Posts: 106
Joined: 25.Aug.2005
From: TX
Status: offline

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.

< Message edited by machoman013 -- 3.Nov.2005 12:32:26 PM >

Post #: 1

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RE: Sender ID Filtering in SP2 - 9.Nov.2005 5:03:03 PM

Maltliqher56

Posts: 3
Joined: 8.Nov.2005
Status: offline

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

(in reply to machoman013)

Post #: 2

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

machoman013

Posts: 106
Joined: 25.Aug.2005
From: TX
Status: offline

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.

(in reply to Maltliqher56)

Post #: 3

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

Maltliqher56

Posts: 3
Joined: 8.Nov.2005
Status: offline

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

(in reply to machoman013)

Post #: 4

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

machoman013

Posts: 106
Joined: 25.Aug.2005
From: TX
Status: offline

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

(in reply to Maltliqher56)

Post #: 5

RE: Sender ID Filtering in SP2 - 9.Nov.2005 9:23:45 PM

consultOz

Posts: 901
Joined: 11.Mar.2005
From: Virginia, USA
Status: offline

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

_____________________________

Good luck and Best Regards
Oz Ozugurlu
MVP (Exchange)
MCITP (EMA),MCITP (EA), MCITP (SA),
MCSE 2003 M+ S+, MCDST
Security+, Project+ ,Server+
http://smtp25.blogspot.com (Blog)

(in reply to machoman013)

Post #: 6

RE: Sender ID Filtering in SP2 - 9.Nov.2005 9:25:45 PM

machoman013

Posts: 106
Joined: 25.Aug.2005
From: TX
Status: offline

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?

(in reply to consultOz)

Post #: 7

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

Maltliqher56

Posts: 3
Joined: 8.Nov.2005
Status: offline

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"

(in reply to machoman013)

Post #: 8

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

anihimous

Posts: 3
Joined: 13.Jan.2006
Status: offline

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?

(in reply to machoman013)

Post #: 9

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

justbasit

Posts: 1
Joined: 14.Aug.2008
Status: offline

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.

(in reply to anihimous)

Post #: 10