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Forward unknown recipients to other server
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Forward unknown recipients to other server - 28.Jan.2002 12:47:00 PM
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koggen
Posts: 980
Joined: 31.Oct.2001
From: Göteborg - Sweden
Status: offline
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Hi! I need to integrate an Exchange server with a Linux-based Sendmail server (both servers serve the same SMTP-domain). I would like to configure the Exchange server to forward mail with unknown recipients (i.e. users without an Exchange mailbox) to the Linux server (where we only have POP3/IMAP accounts). I know how that's done. The point is, if I configure (still have to find out how - but that's another issue) the Linux Sendmail daemon to forward unknown recipients to the Exchange server (so that users with POP3 can send mail from the Linux server to users with an Exchange account), what will happen when there is NO recipient at all for a certain address? Will the servers keep sending that particular message to each other until one of then decides "too many hops" and deletes it? Or what else will happen? Which server will finally send a non-delivery report to the message originator? I will in due time conduct some field tests but I would like to be prepared as much as possible! Any other tips, ideas, best practice experience etc is gratefully accepted! Please send comments to johan.sandqvist@home.se Regards, Johan [ January 28, 2002: Message edited by: Johan Sandqvist ]
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RE: Forward unknown recipients to other server - 28.Feb.2002 12:43:00 AM
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koggen
Posts: 980
Joined: 31.Oct.2001
From: Göteborg - Sweden
Status: offline
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Hi Ishmell!
Thank you for the info. I'm already using that option. The point is: how do you make Exchange stop forwarding unknown recipients if you already have checked against local user database?
Consider the following situation: user A on the Exchange server sends an email to user B (which only resides on the Unix server). I've configured exchange to forward the message to the Unix server which gladly accepts the message for user B. When user B replies to user A sendmail checks against the local database, doesn't recognize the recipient ('cause user A is located on the exchange server) and then forwards back to the exchange server and after that delivered to user A. I intend to let the Unix server forward to a DIFFERENT virtual SMTP server (vss) than the default exchange vss. The reason is: if user A accidentally misspells the user B address, mail would loop back and forth between the exchange server and the Unix server (because the necessary mutual "forward unknown recipients" function). So I therefore intend to let the Unix server forward to a vss which does NOT forward any unknown recipients, but instead should respond with a NDR if the recipient is still unknown despite of being sent to two servers.
So far IÆm just theorizing. IÆm setting up a lab site to test this IRL. I think this should work but thereÆs still one major problem: how to rewrite the SMTP headers for mail received from the unix server. Sendmail can forward unknown recipients to the exchange server *but* rewrites the address to e.g. userA@server.domain.com instead of userA@domain.com. In exchange 5.5 it was a piece of cake to fix this, but I havenÆt found an easy way in exchange 2000. So far IÆve come up with the solution to configure the default recipient policy to accept mail for server.domain.com as well as domain.com. The problem is that all exchange users would have to have dual mail addresses, e.g. userA@domain.com and userA@server.domain.com (which even though it works, doesnÆt sound like a nice solution). I know just about enough to realize that perhaps an event sink could fix this, but I definitely donÆt have the knowledge or the resources to create such a sink. Any help or suggestions on this are greatly appreciated!
Regards,
Johan
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RE: Forward unknown recipients to other server - 2.Mar.2002 12:15:00 AM
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ishmell
Posts: 6
Joined: 27.Feb.2002
From: WA
Status: offline
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Hmm... that does sound difficult. My first suggestion is obvious and lame, but what about just making unix users submit to SMTP server on exchange and disabling unix forwarding? Yeah, that's lame... but easy.
I don't think a virtual server will allow you to not forward on mail for that domain... I think that's handled specifically by the recipient policies. This seems like a tough call actually. Sorry I couldn't be of more help!
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