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Unauthorized use of Exchange Server 5.5

By msteeves ·
I routinely find people not associated with our company using our exchange server as an outgoing mail server. How can I prevent this?

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Unauthorized use of Exchange Server 5.5

by pVp In reply to Unauthorized use of Excha ...

Search the articles here for "Port 25" and maybe "Security."

These are spammers using your server for a pass-through, since you haven't blocked port 25 from outsiders.

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Unauthorized use of Exchange Server 5.5

by msteeves In reply to Unauthorized use of Excha ...

The question was auto-closed by TechRepublic

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Unauthorized use of Exchange Server 5.5

by DAO251 In reply to Unauthorized use of Excha ...

install latest SP and follow:

http://www.microsoft.com/technet/exchange/relay.asp

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Unauthorized use of Exchange Server 5.5

by msteeves In reply to Unauthorized use of Excha ...

The question was auto-closed by TechRepublic

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Unauthorized use of Exchange Server 5.5

by Rudolph(UK) In reply to Unauthorized use of Excha ...

In the Connections container of your site go to the Internet Mail Service (Your Site) Properties, click the Connections tab and tick on either "Clients can only submit if homed on this server" or "Clients can only submit if authentication account matches submission address" as it suits your case.

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Unauthorized use of Exchange Server 5.5

by msteeves In reply to Unauthorized use of Excha ...

The question was auto-closed by TechRepublic

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Unauthorized use of Exchange Server 5.5

by knudson In reply to Unauthorized use of Excha ...

I will assume you have the IMC installed.
go to the Exchange, Server, Connections, IMC, ROUTING
Make sure the check
'Do Not reroute incoming SMTP' is checked.
MS should have been spanked for not making this the default.

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Unauthorized use of Exchange Server 5.5

by msteeves In reply to Unauthorized use of Excha ...

The question was auto-closed by TechRepublic

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Unauthorized use of Exchange Server 5.5

by msteeves In reply to Unauthorized use of Excha ...

This question was auto closed due to inactivity

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