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Another 550 571 Unable to relay error

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Another 550 571 Unable to relay error - 9.Jan.2009 2:13:25 PM   
ljgross

 

Posts: 14
Joined: 16.Dec.2008
Status: offline
New to Exchange 2007 SP1 and ForeFront. We have some applications that are used to send out emails upon confirmation or denial of financial information. When the email is sent to external addresses we get the unable to relay error. I did create a receive connector and if I put the ip of the pc sending the email and restart the hub service it works. The problem I have with this solution is that if you have hundreds of pcs needing this solution it becomes unmanageable.

Any other ideas?
Post #: 1
RE: Another 550 571 Unable to relay error - 9.Jan.2009 2:41:44 PM   
de.blackman

 

Posts: 3542
Joined: 4.Apr.2005
From: Toronto, Canada
Status: offline
Unfortunately that is the nature of the beast! You have to specify either unique IP addresses on the connector (which I think is more secure because you know exactly what machines you as an administrator have allowed to relay through exchange) or specify a subnet of IPs. I personally prefer the first option. I had some issues with a client who were having the same feelings as you are saying that they had too many machines and it could be unmanageable, so going against my recommendations they used the subnet option. About 2-3 months down the road, guess what??? One of their PCs on the network was infected with a virus and it started relaying spam messages through their exchange server, cause them to be blacklisted for sometime. Finding that machine was a pain!!!! But of course this was a one-off thing.

Allowing application servers to relay off Exchange Server 2007
http://msexchangeteam.com/archive/2006/12/28/432013.aspx

_____________________________

Ibrahim Benna - Microsoft Exchange MVP
Forum Moderator
Navantis
@IbrahimBenna

(in reply to ljgross)
Post #: 2
RE: Another 550 571 Unable to relay error - 9.Jan.2009 3:11:07 PM   
ljgross

 

Posts: 14
Joined: 16.Dec.2008
Status: offline
Thank you for your prompt response. Of course that is not what I wanted to hear, but if the system is setup to function this way I will live with it.

Thank you again.

(in reply to de.blackman)
Post #: 3

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