Solved

Cisco ASA drops email (SMTP) from some domains

Posted on 2010-11-11
2
1,316 Views
Last Modified: 2012-05-10
We are missing some emails from Domains.  I have enclosed the logs for one paticular domain that can not send back to us.


Built inbound TCP connection 14677106 for outside: xxx.xxx.250.xx/59339 (xxx.xxx.250.99/59339) to inside:xxx.x.x.xx/25 (XX.151.25.XX/25)


Deny TCP (no connection) from xxx.xxx.250.99/59339 to XX.151.25.XX/25 flags ACK  on interface outside
Deny TCP (no connection) from xxx.xxx.250.99/59339 to XX.151.25.XX/25 flags ACK  on interface outside
Deny TCP (no connection) from xxx.xxx.250.99/59339 to XX.151.25.XX/25 flags PSH ACK  on interface outside
Deny TCP (no connection) from xxx.xxx.250.99/59339 to XX.151.25.XX/25 flags ACK  on interface outside
Deny TCP (no connection) from xxx.xxx.250.99/59339 to XX.151.25.XX/25  flags ACK  on interface outside
Deny TCP (no connection) from xxx.xxx.250.99/59339 to XX.151.25.XX/25 flags ACK  on interface outside

Not sure why some are coming through and others are not.
0
Comment
Question by:Tech_guy
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 20

Accepted Solution

by:
EndureKona earned 250 total points
ID: 34114655
0
 
LVL 76

Assisted Solution

by:Alan Hardisty
Alan Hardisty earned 250 total points
ID: 34116702
The CISCO ASA will have ESMTP Inspect / Inspect ESMTP (equivalent of SMTP Fixup) - this is well known to cause mail-flow issues and should be disabled on your ASA device.

If you can't find SMTP Fixup - look for ESMTP Inspect and disable it.
0

Featured Post

Edgartown IT Case Study

Learn about Edgartown's quest to ensure the safety and security of the entire town's employee and citizen data. Read the case study!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This past year has been one of great growth and performance for OnPage. We have added many features and integrations to the product, making 2016 an awesome year. We see these steps forward as the basis for future growth.
On Feb. 28, Amazon’s Simple Storage Service (S3) went down after an employee issued the wrong command during a debugging exercise. Among those affected were big names like Netflix, Spotify and Expedia.
how to add IIS SMTP to handle application/Scanner relays into office 365.
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…

688 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question