Multi wan - mailserver on dmz - lan users can't access mail server

[dgerard]

Hello, i'm new on pfsense and i've got a problem.
My ISP gives me 2 ip and one gateway

I've setup pfsense with 3 interfaces :

lan on 192.168.1.0/24
wan on 194.x.x.98/29
dmz on 192.168.20.x/24

My gateway is 194.x.x.97

i've added a virtual ip for 194.x.x.99
and i've nat 1:1 one ip to my mail server 194.x.x.99 -> 192.168.20.18

i've created rules for access imap, webmail and when i try to access webmail, everything works

My lan computers are using wan 194.x.x.98 for surfing and my problem is they can't access mailserver
via 194.x.x99. If i want to access mailserver i must type ip 192.168.20.18 in browser or mail client.

What can you advise me to be able to access my mailserver from 194.x.x.98 to 194.x.x.99?

Thanks a lot for your answers, Damien

[jahonix]

Your users are probably not accessing the mail server by its IP but via its hostname, right? (like mail.example.com)
Have a look at split-DNS locally then.