Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Mail loopback

Ok so, I have an ASA acting as a firewall for a bunch of hosted servers, includig a bunch of Small Business servers. Each customer server is on its own vlan and are trunked into the asa. My office mail server is on the inside interface.


Inside =vlan1 my mail server at

trunk10 =vlan10 pat/nat to

trunk20 =vlan20 pat/nat to

trunk30 =vlan30 pat/nat to


pat/nat rules are set up so that each customer has their own public ip for services they are running (https/mail mostly)

I've got some other stuff going on but thats the key config.

Everything works great except that hosted customers cant send me emails and viseversa as well as inter-customer. I understand why thats not allowed but I need to get it to work in a scaleable way with out something crazy. Best I can tell I either need to route inter-customer mail internally and do a bunch on the exchange/dns side, ot get the asa to allow traffic on port 25 between the outside interface IPs.

Also if something above is totally jacked up let me know.

Thanks in advance

Mike Schietinger

Everyone's tags (4)
New Member

Mail loopback

I hate to bump a thread but I'm hoping someone has some idea of the "right way" to route mail between my vlans

CreatePlease login to create content