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I have an exchange server with the domain

Outgoing e-mail goes through a mail gateway which rewrites addresses to

Unfortunately calendar and meeting requests to external people are broken since they still show the domain. So we can't invite external people to meetings.

How can I fix this?

(I can't remove the mail gateway)

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Why are addresses being re-written? Exchange has no need to do this, I've not seen a gateway that requires this, and the obvious solution to your issue, that doesn't mean removing the gateway, is configuring the correct email addressing scheme in exchange and stop the gateway from re-writing email addresses.

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Internally we have lots of sub-domains that decide where mail is routed to. For example is routed to, but lots of e-mail is routed from e.g. to We mustn't break anything else but need to fix the calendaring issue. – user114441 Apr 13 '12 at 11:58

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