Error 554 5.7.1 Error: deny openrelay

In Exchange 2010 we have our main domain name and then we have two other domain names, so each user they have 3 possible email addresses they can use.  We can receive from all three addresses internally.  However we can only receive from external email addresses to the main email address.  If I try to send an email address from like gmail I get the following error:  554 5.7.1 Error: deny openrelay.  Where would I need to add these other email addresses in Exchange?
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Vaseem MohammedCommented:
Check this article.
Also make sure you have completed the per-requisites mentioned in above article i.e., MX records in place for the additional domains.
Simon Butler (Sembee)ConsultantCommented:
I am pretty sure that is NOT an Exchange error.
Therefore you should check that the other domains have their MX records pointing at your server and not somewhere else.


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