Solved

postfix in AWS to relay to IronPorts

Posted on 2016-09-02
4
38 Views
Last Modified: 2016-09-14
I have setup postfix in AWS to relay to IronPorts .

 From time to time I have  "Connection timeout " especially when  more than 20 emails at the same moment. These messages deferred into queue. Eventually they being delivered - but with unacceptable delay .  

AWS server - RHE 7.2- M4 -Enhanced network 10Gig

IronPorts administrators said there is nothing on their side.
0
Comment
Question by:andrey_chevron
[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
4 Comments
 
LVL 37

Expert Comment

by:ArneLovius
ID: 41782601
Connection Timeout is too generic to be able to do any sensible diagnosis

I would suggest following the postfix debugging documentation

http://www.postfix.org/DEBUG_README.html

in particular "Verbose logging for specific SMTP connections" and "Record the SMTP session with a network sniffer"
0
 
LVL 78

Expert Comment

by:arnold
ID: 41783270
Is your relay com big cludes authentication?
Are you replying all outgoing message through them?
Look at the /var/log/maillog to see when timeouts are reported .....
1) there is either a threshold on their side limiting number of connections from the same IP, or limits on connections/messages from the same source within a certain amount of time, where they introduce delays in response, but those delays exceed the connection timeout period set on your side.

Are the messages being denied destined to the same destination?
0
 

Accepted Solution

by:
andrey_chevron earned 0 total points
ID: 41791559
Amazon put a limitation on port 25 by default. After throttle  was tunes everything is normal.
0
 

Author Closing Comment

by:andrey_chevron
ID: 41797510
I found it myself
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
pvcreate issue 5 100
Mail Server IP address 2 55
CentOS 7 wireless 2 83
VPN, Squid-  unable to log https requests 5 116
The new Gmail Phishing Scam going around is surprising even the savviest of users with its sophisticated techniques.
Google Drive is extremely cheap offsite storage, and it's even possible to get extra storage for free for two years.  You can use the free account 15GB, and if you have an Android device..when you install Google Drive for the first time it will give…
Connecting to an Amazon Linux EC2 Instance from Windows Using PuTTY.
How to Install VMware Tools in Red Hat Enterprise Linux 6.4 (RHEL 6.4) Step-by-Step Tutorial

738 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