Configure Exchange 2003 to check recipients in SMTP protocol

RE: Configure Exchange 2003 to check recipients in SMTP protocol

Todd Booher — Thu, 23 Oct 2003 22:59:00 GMT

Great tip David! Will you post back when this is put in a KB article. Also, any plans by the exchange group to look at implementing SPF records for use with Exchange? http://spf.pobox.com/ Thanks, Todd

RE: Configure Exchange 2003 to check recipients in SMTP protocol

David Lemson — Fri, 24 Oct 2003 21:31:00 GMT

We have been involved in a number of groups, both internet-focused and industry-focused, that are looking at how to reduce spam and spoofing on the Internet. The short answer is: yes, we are looking at implementing things like SPF to help stop spoofing.

RE: Configure Exchange 2003 to check recipients in SMTP protocol

Karan Mavai — Thu, 30 Oct 2003 20:19:00 GMT

David, Does Exchange 2003 support the "tarpitting" with the recipient filtering? If so, how would it be configured?

RE: Configure Exchange 2003 to check recipients in SMTP protocol

Madura — Fri, 31 Oct 2003 07:10:00 GMT

If we have message journalling to an external SMTP address enabled. Will the forwarded emails be scanned before going out, by an Anti Virus software like Scan Mail etc..(we dont have SMTP level scanners). Do the forwarded email enter the information store and then sent out? Thanks, Madura

RE: Configure Exchange 2003 to check recipients in SMTP protocol

David Lemson — Mon, 03 Nov 2003 21:23:00 GMT

<body xmlns="http://www.w3.org/1999/xhtml"> Todd: there is a quote from one of my co-workers in <a href="http://www.msnbc.com/news/986879.asp">this MSNBC story</a> that talks about spf.pobox.com as well as some other things. </body>

RE: Configure Exchange 2003 to check recipients in SMTP protocol

David Lemson — Mon, 03 Nov 2003 21:35:00 GMT

Oops, I forgot not to post comments within WinBlogX... sorry :-) Karan: No that feature is not built in. We are considering it for the future. Madura: It depends on your topology. I would say that in most cases, forwarded mails do not enter the information store to be scanned for viruses by store-based virus scanners. Many virus scanners do not have SMTP-based virus scanners, in Exchange 2003 we added a new interface to make it super-easy for them to adapt their store-based virus scanners to work on SMTP.

RE: Configure Exchange 2003 to check recipients in SMTP protocol

manirron — Thu, 13 Nov 2003 18:55:00 GMT

RE: Configure Exchange 2003 to check recipients in SMTP protocol

imdoe39 — Thu, 13 Nov 2003 18:55:00 GMT

RE: Configure Exchange 2003 to check recipients in SMTP protocol

imdoe39 — Thu, 13 Nov 2003 18:58:00 GMT

hello: is there any anti-spoofing in exchange 2000?..in other words can I tell it not to accept any emails claiming to be from local mailboxes if the source IP address is not one we specify ?

RE: Configure Exchange 2003 to check recipients in SMTP protocol

Madura — Fri, 02 Jan 2004 19:50:00 GMT

Thanks for the previouse reply. I have another question on journaling. I need to journal all the emails on an Exchange 2000 server to an external smtp address and it should be 100% reliable. I have enabled journaling and it works.. But If the remote server fails (external journaled smtp address is unreachable) I dont receive any NDRs for the journaled emails. How can we avoid this situation. I need to know if an email is not journaled and I need to journal it back somehow when the remote server is up again. How can we achieve this? Thanks, Madura

re: Configure Exchange 2003 to check recipients in SMTP protocol

Luke Edson — Wed, 03 Mar 2004 16:48:00 GMT

I am in the process of migrating from Exchange 5.5 to Exchange 2003 for a company that has multiple small (less than 5 users) branch offices.

They want to migrate slowly, so here's my dilemma: The current Exchange 5.5 will still be active for a while. I'm using the Exchange Migration Wizard in Exchange 2003 to migrate the mailbox data over.

All incoming mail needs to be split between the two servers, as the new Exchange 2003 server will be gradually hosting more & more of the users.

Can you point me in the right direction where I can learn to write an SMTP event sink to route some recipients to one server, & others to the other? Thanks!

I can't join the Exchange 2003 server to the same Exchange 5.5 site, as it's in a different domain.

re: Configure Exchange 2003 to check recipients in SMTP protocol

Troy — Tue, 27 Apr 2004 12:12:00 GMT

Is there any way to track the IP address of systems recieving the 550 5.5.1 errors? I have SMTP logging turned on, but I don't see anything obvious in the logs that show that the connection was rejected for this reason. I'd like to be able to keep an eye out and if a system is brute forcing I'd like to notify abuse. Anywhere that I could get this info to extract out in an automated way? I.e. can it be logged to the event log?

re: Configure Exchange 2003 to check recipients in SMTP protocol

Scott Hart — Tue, 08 Jun 2004 20:13:00 GMT

What about us poor guys who are still on NT 4.0 Domain and Exchange 5.5? We are getting hammered with Invalid Recepients with an originator of <> I am getting about 10,000 a day.... I need a solution....

Thanks,
Scott Hart...

re: Configure Exchange 2003 to check recipients in SMTP protocol

Christer Hasse — Wed, 09 Jun 2004 09:26:00 GMT

Is there a hack to make Exchange Server 2000 or earlier check recipients in the SMTP protocol or is this only possible in 2003?

re: Configure Exchange 2003 to check recipients in SMTP protocol

David Lemson — Wed, 09 Jun 2004 15:35:00 GMT

It's only built-in to Exchange 2003. It's certainly possible to write code to do it on Exchange 2000 (though not 5.5, sorry Scott, this may be your reason to start planning your upgrade to 2003!), and I believe that some of the "content management" products listed at http://www.microsoft.com/exchange/partners/emailcontent.asp do this. But if you want it built in to Exchange, you need to have Exchange 2003.

re: Configure Exchange 2003 to check recipients in SMTP protocol

Sanoop — Thu, 24 Jun 2004 13:26:00 GMT

Does anybody know the code for Exchange 2000 so that it checks SMTP recipients.

No Exchanges or Refunds

a tech-centric blog from the left — Fri, 25 Jun 2004 02:53:00 GMT

re: Configure Exchange 2003 to check recipients in SMTP protocol

Mark Hicks — Fri, 02 Jul 2004 22:17:00 GMT

Is there a way to accept a message for an invlaid recipient and then delete it without generating an NDR to the (usually fake) sender? I still want to generate an NDR for my internal users when mail cannot be delivered to an external recipient. -Thanks.

re: Configure Exchange 2003 to check recipients in SMTP protocol

Pablo Melchor — Fri, 06 Aug 2004 11:18:00 GMT

Hi Dave,

Great article! I have another question: how can I prevent a "fake domain user" from sending e-mail to real domain users? E.g.: I would like to see an error message after a
MAIL FROM: fakeuser@ourdomain.com

Thanks!!

re: Configure Exchange 2003 to check recipients in SMTP protocol

Karen — Tue, 10 Aug 2004 01:14:00 GMT

I've tried filtering the recepients mail as it was discrubed here, but it didn't work.
I have 2003 SBS.
Can anyone help me? Is there anything I should check?

Thanks,
Karen.

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