Host Not Found

[omni17]

hi,

i've been having a difficult time trying to trouble shoot this one. Our ladies in HR constantly email various users at monster.com and lately they've been getting bounce messages. I've tried to work with monster and they stress that the problem is on our side; however, we haven't made any changes to our email server and this problem just now started about 3 weeks ago.

We run NT4 server sp 6a and exchange 5.5 below is a copy of the bounce message when emailing a potential canidate at monster.

------ Failed Recipients ------

<itmfpbazfdcu4c0ydk1vvh5u49g04ca1@users.monster.com>: Host not found.
-------- Returned Mail --------

Received: from unknown(192.168.0.10) by (insert mail sever here) via csmap
id 1345; Wed, 06 Aug 2003 15:17:22 +0000 (UTC)
Received: by (insert mail server here)with Internet Mail Service (5.5.2653.19)
id <QA4P98HL>; Wed, 6 Aug 2003 10:25:16 -0500
Message-ID: <E6004BE0638FD5118C4800508BE99C0D04E22E11


Monster sets up those jacked up user names for clients that use their site and they insist that it couldn't be an issue. We are able to email other sites like dice or computerjobs.com but for some reason we are unable to email monster anymore.

At this point i'm not sure what to check on the exchange server if anything or what other feedback i could provide to monster to try and get this resolved.

Thanks for looking, and any help is greatly appreciated.

 

[chronos1]

hi omni17

the fact that it says 'host not found' looks as though your emails are getting out from your exchange but aren't getting resolved to a domain/host. So i would speak to whoever is your ISP - whether they can resolve the domain to an IP address - if they can't, that should be the problem.

Monster.com's MX record for that domain should be resolving to their exchange server IP address - so that all mail to that domain goes to that server.

However it could be that your isp doesn't have the correct IP address resolving that domain - for one reason or another. Or monster doesn't have their exchange server configured to route emails, for that domain, inbound. My guess, though, is that if monster are receiving emails without any difficulty, the problem may be at your ISP's end.

Good luck

my 10 cents, my 2 cents is free..

 

[omni17]

thanks for the response chronos1.

I did an ns lookup just for grins

nslookup -type=mx users.monster.com

and that resolved, so could the problem still be my isp?

 

[chronos1]

Hi omni17

did you use nslookup from your server or on the internet? If on internet then their probably going through another server to resolve names, but if going through your server, should be correct. Might be just as well to give your ISP a call to see whether they are resolving properly also.

2 IP addresses i got for them was 63.121.29.25 and 63.112.169.25 via internet nslookup tool.

good luck

 

[omni17]

I just wanted to give an update on this. It turns out that monster got onto one of the spam lists that we use and we were blocking them that way. It took a little longer to get this figured out but we finally have it working.

Thanks for all your help.