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GWIA sending to least preferred MX server

Posted on 2008-11-03
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Last Modified: 2013-11-12
NetWare 6.5 SP7, Groupwise 7.03 GWIA is returning a 550 relaying denied for a specific domain.  They have two MX servers, one a preference =10 that has an account for the user, and the other preference = 90 that does not.  Our GWIA for some reason is sending to the least preferred MX and my question is why and can I force it to send to MX=10?   thank you
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Question by:facutvivo
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rmyers1968 earned 2000 total points
ID: 22880630
Yes you could force it (by trickery and not recommended) but most likely this would not resolve your issue. You will simply get a message eventually stating the message could not be delivered in a reasonable amount of time.

To briefly explain MX records. If you have multiple MX records people will always try the one with the highest pref (meaning the lowest number, in your case 10). If for some reason it can not contact that server (too much traffic, server down, your server blocked as spammer) it will move to the next highest pref and so on.

In your case for some reason you can not talk to it. So do the following checks.

Are you a known spammer check out your status on dnsstuff dot com and run the free report if you have 0 in spam blacklists, move on if not, you might be blocked due as a spammer.

It could be a time out issue, you may want to increase the timeout delay on the GWIA (Your firewall or their firewall may be causing the delay) Your firewall logs could help.

You should look at your GWIA logs to see what is going on.

Generally speaking you should email postmaster at the sender domains site explaining your problem. If no response hop on the web find their phone number and give them a call and ask to talk to their email guy.

This secondary MX entry they have is a problem and appears useless and should be fixed or removed...

One other thing the DNS the GWIA server points to is it your or external? You found MX info so I assume you used a lookup tool for this. Check with other DNS server do they all agree with the MX info you found?

Good luck
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by:facutvivo
ID: 22880796
they removed the useless MX server which fixed the problem.  The secondary MX was a yahoo.com site that they were using as a backup in case their mail server went down.  Didn't make much sense to me; I'm not going to worry about why my GWIA was responding with no relay error.  Bottom line it's working now.  thank you for your comments.
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