Can't read mails when on LAN

Hi there. I really need some help:confused: PLEASE.

First i read this article, in hope that i could help me a bit.
http://www.smallnetbuilder.com/secur...teway-reviewed.

But no luck, so now i try the forum out.

I run a mailserver on my Synology DS408 and i have had an Zywall2 as my firewall, no problems in reading my mails regardless if i was connected to LAN (iPad or PC) or WAN (3g via iPhone or external network).

Now i have changed the Zywall2 with a brand new Zywall USG-20 (for better protection and more speed) but now i can't read my mail when i'm connected to LAN only from the outside!

I have tried different settings in my NAT and firewall, but no luck getting through.

Anyone having an idea, what could be wrong in my setup?

Attached Images

	NAT.jpg (44.5 KB)
	Firewall.jpg (9.3 KB)