Making Exchange RFC-821 compliant

Our exchange server hots mails for mydomain.com.  But the HELO command going out reads exchange.domain.local.  One of our vendors is telling me that because of that, their server is bouncing out mail.  I am being told I need to make our Exchange server RFC-821 compliant by making sure our HELO command reads contains the same domain name as our mail.

Can someone assist me in understanding how to make this happen?
crp0499CEOAsked:
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Matthew MillersConnect With a Mentor Commented:
In the SMTP Virtual Server.
Delivery tab
Advanced button
Fully qualified domain name

If you are using the VS to relay to other exchange servers in your org, make sure that the name can be resolved to the correct internal address on your internal DNS
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