Exchange Send as second domain

Posted on 2014-08-13
Last Modified: 2014-08-14
HI all,

On our exchange server we have for example

now we also have a second domain. I have configured the exchange so that is sent to However, when in outlook (i add to 'other email address' in the from drop down) i try to send as i get the following send as error;

You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission.

any ideas on how i can correct this?
Question by:flynny
    LVL 23

    Expert Comment

    Are these mail addresses for different accounts? If so you need to delegate permissions (or set send as permissions) for user to the account. If you want to send mails as a different user that user needs to have correct permissions for that action.

    Author Comment


    man thanks for the prompt reply, i have done the following;

    I have added the emailaddress policy for '' i have done the following;

    Exchange -> Organisation Configuration -> Hub Transport -> New Email Address Policy...

    I have then for all receipients added the rule

    This is added with the priority of 1.

    this should in theory allow to send as am i correct?

    However this is not working? and giving the send as issue?
    LVL 63

    Accepted Solution

    That is the expected behaviour.
    As far as Exchange is concerned, users only have one email address - the default. That is used for all outbound email. Any other addresses are aliases for inbound email only. IT IS NOT POSSIBLE to select one of the aliases to use for outbound email natively.

    You have three options.

    1. A third party tool called Choose From.
    2. Configure a dummy POP3 account in Outlook.
    3. Configure an additional account in Exchange, then add that account to Outlook. You can then use the From field to control which address the email goes from. That does not require additional CALs.

    LVL 23

    Expert Comment

    Agree with Simon. The way you configured it i was under the impression that you actually had 2 different accounts. This is however (as stated by Simon) on of the options on how to do this.

    Author Closing Comment

    thanks for clarifying this

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