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08-27-2007, 10:51 PM #1Web Hosting Guru
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Trouble with Exim and my Current Host
I have clients that I host that can't email certain domains which I know do exist.
The support people are telling me that the domain name doesn't resolve, yet the MX records and everything are correct for the particular domain that these people are either sending email to or receiving email from.
For example:
If a user I host sends and email to user@domainx.com ... they receive one of two messages:
retry timeout exceeded
or
retry time not reached for any host after a long failure period
If user@domainx.com sends and email to anyone that host, they receive a bounce back with a message saying that mail delivery was delayed for xx hours and will try for up to 5 days. It will eventually fail.
domainx.com is perhaps one of the largest ISPs in Canada and my host is telling me that everything is working OK because they can send / receive mail from gmail to my customers.
Anyone have any suggestions on what to look for?
I don't think my host is capable of solving this!
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08-28-2007, 12:06 AM #2Web Hosting Guru
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- Feb 2006
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Re:
Dear geekie246,
Did you tried to take DNS Report of Domains which are not resolving ?
Best Regards.Tom F - VCA-WM, VCA-Cloud, VCA-DCV, CISSO, CPTE, OSCP, RHCE, RHCT
Maxim Support - Hosting Solutions & Server Management
Email : tom@maximsupport.com
Web : http://www.maximsupport.com
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08-28-2007, 12:19 AM #3Web Hosting Guru
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Yes, I ran the email test and it finds the correct MX record at the smtp server ...
Plus, have tried other systems and they all resolve the correct MX record for the domain in question.
I can send to the user@domainx.com from any other email account, or any other ISP, except for those associated with my reseller account, mail gets successfully delivered to user@domainx.com.
I'm getting complaints from all the domains that I host about this issue, and I'm stuck ... zero technical support is doing .... they keep telling me it's not a valid domain that my customers are sending to, yet it's one of the LARGEST ISPs in our country here and several of the emails I've been sending to for about 9 years so I know they are valid.
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08-28-2007, 01:04 AM #4Junior Guru Wannabe
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- Jan 2007
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- 31
How about sending email between the clients that you host (internal test email)? Is there any issue with it? Are you using firewall? Have you tried to temporary disable your firewall and try to send email to user@domainx.com from one of your reseller account?
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08-28-2007, 02:39 AM #5******* Unleaded
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- Feb 2004
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Good ol' EXIM.
Your host may be using the "callout" spam checking "feature"
What it does is this:
on receiving an inbound connection, it tries to open up a outbound connection to the other server and start to send an email to the null user to see if the other server accepts bounces.
What goes wrong is this:
the original server might not accept mail to the null user, or,
the original server might also want to do the same test, or
the original server might refuse the connection because the dns records of the exim server are hosed.
The result, is a mexican standoff.
I have seen this personally, and I did not bother telling the idiot about it because they could not accept email from me anyways.
It is the most ill-advised spam control *feature* I have ever seen.
Wave the next time you go past HolyroodLast edited by plumsauce; 08-28-2007 at 02:42 AM.
edgedirector.com
managed dns global failover and load balance (gslb)
exactstate.com
uptime report for webhostingtalk.com
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08-28-2007, 06:33 AM #6Web Hosting Guru
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All mails are delivered internally from all the domains that I host. No issues.
The host that I'm using is firewalled and they have indicated that they had removed the firewall completely at one point. Same result.
Thanks for the suggestions though ... I had thought of those things early in the process!
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08-28-2007, 06:35 AM #7Web Hosting Guru
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08-28-2007, 10:23 AM #8Web Hosting Evangelist
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- Melbourne, AU
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WK Woon
CTO | http://www.aflexi.net - A flexible Network
Building the next generation CDN platform - DEMO .... coming soon
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08-28-2007, 10:26 AM #9Web Hosting Evangelist
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geekie246, if you have local access to the system, try running this php script to determine how the mail will be routed on your host's server:
<?php passthru('/usr/sbin/exim -bt recipient@domain.com'); ?>
(presuming exim's in /usr/sbin.. adjust to suit)WK Woon
CTO | http://www.aflexi.net - A flexible Network
Building the next generation CDN platform - DEMO .... coming soon
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08-28-2007, 05:10 PM #10Web Hosting Guru
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I run this script and it goes out and apparently finds the smtp servers ...
Looks like it is a valid response. I would post the results here but do not want to have this person subjected to a pile of spam. LOL! Then again, they aren't receiving any email so that won't be a problem.
LOL!
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08-28-2007, 11:16 PM #11Web Hosting Evangelist
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So it isn't a DNS problem eh.
WK Woon
CTO | http://www.aflexi.net - A flexible Network
Building the next generation CDN platform - DEMO .... coming soon
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08-29-2007, 05:27 PM #12Web Hosting Guru
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Nope.
It is working now however. But I'm not sure for how long and I am not sure what the host has done to make it work.
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08-29-2007, 05:51 PM #13Web Hosting Master
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RACK911 Labs | Penetration Testing | https://www.RACK911Labs.ca
www.HostingSecList.com - Security Notices for the Hosting Community.
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08-29-2007, 07:35 PM #14Web Hosting Guru
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Aliant (Bell)
Any mail from anyting related to their network was being hosed!
Working again now though