Wouldnt the MX record for the domain need to know the new port also? I mean the data is being sent to port 25 at your IP address so if you close port 25 the traffic cannot be recieved?
I'm likely missing the point here but I thought that changing the port in this way would only work for outbound mail, not inbound.
Would a better question be to ask why you need to change the port, as there may be a better solution? |