Question...
 
If we were place our new email server behind a secure NAT, I assume all incoming emails will process okay, because of the external to internal NAT translation...  
 
My question is; isnt all outgoing email suppose to also be sent from the same IP address as specified from the MX record? or is the external IP from the firewall okay?
 
The reason is, I want to move our existing email server from the exposed internet (running a s/w firewall) behind a h/w firewall.  I'm just afraid that all outgoing emails will be rejecting because our MX record and all outgoiing traffic through the firewall will not be the same... 
 
Many thanks in advance.
eddie :)

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