How do I route email for my internal domain our of the externally? Authoritative / Internal Relay / External Relay

Posted on 2011-04-20
Last Modified: 2012-05-11
I have a need to route emails from my internal domain (specifically one email address) out of the building. I have a perimeter mail server which will pick up emails routing out to a set recipient and mass mail from it. The options have changed in Exchange 2007 from 2003.

Here are my options.....

Authoritative Domain - Selected
To specify that recipients in this domain have mailboxes in this organization, select this option.

Internal Relay Domain
To specify that recipients in this domain do not have mailboxes in this Exchange organization but do have contacts in the address book and that mail will be relayed for this domain through Hub Transport servers in this Exchange organization, select this option.

External Relay Domain
To specify that recipients in this domain do not have mailboxes in this organization and that e-mail will be relayed for this domain through the Edge Transport servers, select this option.

If I send an email to it fails to resolve internally and an NDR is generated. I need to have this resolve externally if the local mailbox does not exist. Presumably this is because it is an authoritative domain.

I understand the concept of the above, and some but I dont want to start changing global settings in our live system without a better understanding of the concequences.

Can I just set my primary incoming domain to be internal relay?
What are the concequences?
Do I need to setup "contacts in the address book", if so, where?

Thanks for the feedback.

(PS I'm not generating SPAM!!)
Question by:noooodlez
    LVL 8

    Expert Comment

    emails sent to internal domain cannot go out of the network. irrespective of what you select on the accepted domain, as long as exchange sees that the email domain exists within the network it will not go out.

    Accepted Solution

    It does route email out if it is set as an Internal Relay Domain. I have set / tested it on one of our spare (alias) domain names.

    I just dont want to change our main domain from authoritative without testing / advice!

    Author Closing Comment

    I set my primary incoming domain to be internal relay and emails are now relayed on to the next mailserver.

    Chers for your input.

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