How about :

Change the port forwarding on site A to send SMTP traffic to the 
server at site B.

Configure the server to use Site A router for it's external gateway ? 
If there isn't too much traffic then just do it for the whole server, 
otherwise use policy routing to send just SMTP traffic via site A.


Also, how dynamic is the address at site B ? If the address only 
changes infrequently, and this is a temporary setup, then could you 
get away with setting a short TTL on the MX record and changing it as 
required ? Or even use one of the dynamic-ip-to-dns services for the 
hostname in the MX record.



Or, setup a temporary mail server at site A, with the same config 
(user accounts etc) as the main server, but forwarding all received 
messages to the other server.

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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