Mail Server SMTP Service behind EFW 3.05 beta1

[Guest]

[MattHo]

Dear All,

I've created a mail server (Mailenable Standard Verison) on Orange Zone and enabled SMTP Proxy.
All function working fine on Android & Windows devices except iOS.
iOS device cannot connect to SMTP services, I've try to move the server out of the firewall, all services work normal.
Anyone can help me please?

Below is my setting details:
Mail Server IP: 10.1.1.10
Orange Zone Gateway IP: 10.1.1.1

Public IP  1: 189.168.2.1
Public IP  2: 189.168.2.1

All mail will come from Public IP 2 & go out by IP 1:
Incoming Mail : Mail > Public IP 1 > Orange Zone > Mail Server
Outgoing Mail : Mail Server > Orange Zone > Public IP 2 > Internet

Many thanks.

Matt