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I have an internal Exchange 2010 (sp2) server setup for some development projects. The domain is called

All users inside can reach and email eachother but I'd also like to be able to mail users outside This isn't possible since our ISP doesn't allow smtp traffic unless it is relayed through their smtp server.

External mails back into isn't an issue at the moment since the only mails going out is reports such.

I can use either my ISP's smtp server or use Googles (secured in that case). Any solid advices where to start to look would be appreciated. There are some about relaying on the interwebs but most of them are junk (hence don't send links as replies unless you know they are good).

This means

  • Internal mails (on must be transported through the internal exchange servers smtp
  • External mails (not must be transported through an external smtp server


share|improve this question
Exchange allows using a smart host for SMTP relay, and it will automatically resolve internal mail so that it doesn't go out. – user3463 Jul 15 '12 at 4:45

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