RB750 problems setting it up for e-mail

Hi all - I ve installed an RB750 router between the Internet and the mailserver and I wish to set it up for e-mail access and webmail ie: allow access to these ports:

http 80 for mail server
smtp 25 for spam filter
pop 3 for mail server
dns 53

Attached is a topology with the IPs in use and also the config attached.

For some reason I cannot get the WAN interface to transmit any packets…what am I missing?? it’s TX Status is idle whilst the TX status is OK…!!
Untitled.jpg
myconfig.rsc (12.6 KB)

Check “/ip route”. I see no default gateway.

/ip route
add gateway=xx.xx.43.217 dst-address=0.0.0.0/0

If the xx.xx.43.17 is not the gateway for your public network, then change it.