Skip to main content

linux - Exim taking long time to send emails, how to decrease delay in Exim service?



The linux server where exim service is running is under no load.



The system is sending email successfully but is taking a long time to send each email.



Basically if I telnet to localhost port 25 and then I try to send an email from there the response from the server is super slow. The mail application we have running there is taking more than 8 minutes to send 4 emails.




Has anyone confronted this issue before with EXIM and maybe you might now what is the setting that is making EXIM wait so long for something. I am looking at the logs and I cannot see anything indicative of an error. Below a sample of the mainlog:




2009-08-10 07:21:05 H=(aurl.domain.ni) [127.0.0.1] Warning: Sender rate 4.6 / 1h
2009-08-10 07:21:29 1MaTsX-0000mw-Oe <= stgbouncing@theperfectplace.net H=(aurl.domain.ni) [127.0.0.1] P=esmtp S=22003 id=67402024.1249906753667.JavaMail.root@aurl.domain.ni
2009-08-10 07:21:54 SMTP command timeout on connection from (domain.com) [127.0.0.1]
2009-08-10 07:22:42 1MaTsX-0000mw-Oe ** thegroupofbouncing123@earthlink.net R=lookuphost T=remote_smtp: SMTP error from remote mail server after RCPT TO:: host mx3.earthlink.net [209.86.93.228]: 550 thegroupofbouncing123@earthlink.net...User unknown
2009-08-10 07:22:42 1MaTti-0000nM-3b <= <> R=1MaTsX-0000mw-Oe U=mailnull P=local S=23089
2009-08-10 07:22:42 1MaTsX-0000mw-Oe Completed



Answer



The server appears to be doing throttling which might affect you if you are testing from one IP:



2009-08-10 07:21:05 H=(aurl.domain.ni) [127.0.0.1] Warning: Sender rate 4.6 / 1h



Often issues like this are related to poor DNS. Exim does a lot of resolution during processing mail. Check the DNS config on the Exim server. Check the performance on the DNS server it is using.



Is the server doing any DNSBL processing? I'm often asked to look at servers exhibiting poor performance and it turns out they are using DNSBLs that have been retired, meaning lookups are timing out.



Try running exim in debug on the server to see where the problem is. The following will run an Exim daemon on port 26, staying attached to the console and printing lots of debug:



exim -bd -d -oX 26



Then telnet to tcp/26 instead of tcp/25 and test as you had been.


Comments

Post a Comment

Popular posts from this blog

linux - iDRAC6 Virtual Media native library cannot be loaded

When attempting to mount Virtual Media on a iDRAC6 IP KVM session I get the following error: I'm using Ubuntu 9.04 and: $ javaws -version Java(TM) Web Start 1.6.0_16 $ uname -a Linux aud22419-linux 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:39:06 UTC 2009 x86_64 GNU/Linux $ firefox -version Mozilla Firefox 3.0.14, Copyright (c) 1998 - 2009 mozilla.org On Windows + IE it (unsurprisingly) works. I've just gotten off the phone with the Dell tech support and I was told it is known to work on Linux + Firefox, albeit Ubuntu is not supported (by Dell, that is). Has anyone out there managed to mount virtual media in the same scenario?
Post a Comment
Read more

ubuntu - Monitoring CPU, Mem, disk, on a single server

I've been looking for a simple starter solution for monitoring my [currently] single server hosted solution. Other than Nagios and similar, are there other good (simple) solutions people are using? Answer Everything depends on what you want. For example Munin is very simple, you can install and configure it in less then 10 minutes (on one server), it can sends alarms, make graphs from monitoring cpu, mem. apache connections, eaccellerator, disk io and many many more (it has many plugins). But if you are planning in future get some more machines, munin may not be enough. For example in munin you cant monitor state of individual processes, can't monitor changes in files (for security purpose). So if you wanna only see what is the utilization of basics parameters on your server and don't plan to buy some more servers Munin is what you are looking for, but if you wanna be alarmed when some of your service is down, take more control on what is happeninig on...
Post a Comment
Read more

hp proliant - Smart Array P822 with HBA Mode?

We get an HP DL360 G8 with an Smart Array P822 controller. On that controller will come a HP StorageWorks D2700 . Does anybody know, that it is possible to run the Smart Array P822 in HBA mode? I found only information about the P410i, who can run HBA. If this is not supported, what you think about the LSI 9207-8e controller? Will this fit good in that setup? The Hardware we get is used but all original from HP. The StorageWorks has 25 x 900 GB SAS 10K disks. Because the disks are not new I would like to use only 22 for raid6, and the rest for spare (I need to see if the disk count is optimal or not for zfs). It would be nice if I'm not stick to SAS in future. As OS I would like to install debian stretch with zfs 0.71 as file system and software raid. I have see that hp has an page for debian to. I would like to use hba mode because it is recommend, that zfs know at most as possible about the disk, and I'm independent from the raid controller. For us zfs have many benefits, ...
Post a Comment
Read more