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Exchange 5.5 relaying issue

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by numbies

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We have an Exchange 5.5 Server that seems to be allowing relaying and we can't prevent it. We have set Routing Restrictions to allow only hosts and clients that successfully authenticate but it and when we run the RSS test all tests pass except 1 that seems to use a "%" sign instead of the "@" sign in the test recipient's email address.
We have tried everything and are in danger of being disconnected from our ISP - any help would be greatly appreciated.

5 replies

by ann777

Reinstall the latest sevice pack for Exchange and try disabling Relay then. For some reason, this happened to me in the past as well. Service Packs for exchange come in various parts. Make sure all the parts properly install before installing the next an retry. It took a second run through the service pack parts in order to successfully get one site to restrict relay.

by acattr

the % sign won't work. Your exchange box will accept the message, but it will not deliver it as it doesnt know how to send it. Trust me on that. Ask your ISP to try to test your server, as you feel your server is fine. If they can't hack it, they have no right to block you. If you have it set to authenticate clients, your server should be fine, as long as you don't make any exclusions under the IP addresses list.

Is your ISP complaining of you having an open relay, or an open proxy, asthey are two different things. relay has to do with exchange, proxy has to do with, well Proxy.

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