cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
400
Views
0
Helpful
1
Replies

Cisco ASA 5500 SMTP return on source (nat'ed) IP

noc
Level 1
Level 1

We have a number of static PAT as well as policy NAT pointing services from servers and loadbalancers to the outside world on specific ports. In this case, our Postfix Mail server is accepting inbound connections fine, and sending out fine - however.

We are experiencing a number bounces from certain providers due to a SMTP X-Source-Ip being the outside interface of the ASA, thus marked as SPAM. Outbound SMTP traffic needs to returning on SMTP as the originating mapped PAT.

The current config is using mostly policy NAT w/ object groups, and is being trimmed as services and hosts get decommed (objects were imported from a diff FW). I have also tested straight static PAT for SMTP to avoid policy NAT all together. Have also tried w/o 2nd global & nat commands, and have had no luck with either configuration.

Current running config:

Running config attached, with message text.

Open to ANY help on this one.

THANKS!

1 Reply 1

noc
Level 1
Level 1

Apologies, I posted this in the wrong forum, as it is not a VPN issue. I have posted this in Sec->FW.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: