I am moving my mail server from my desktop machine to a server machine. Both these machines are on my SoHo LAN behind a NAT router. Thus to move incoming mail from one to the other I have to change the port forwarding and firewall setings in the router.
Can anyone suggest a way to either send incoming mail to both machines or some other way of testing the new mail server before committing all my incoming mail to it?
I already copy all my mail to another user where it isn't sorted but just gets kept for seven days and then deleted. That is done on my hosting companies system. So I have some protection from total disaster! In addition of course the 'sender' (my hosting supplier) will wait and retry if/when I stop accepting mail so mail shouldn't be lost but I'd really like to do at least some simple testing before the big switch over.