550 Requested action was not taken because this server doesn't handle mail for that user

I run my email using google apps. Occasionally when people try and email me@mydomain.com they receive the following error message. It's happens a few time but is quite hard to pin point what actually causes it. Here is the complete error message

Subject: Returned mail: response error

The original message was received at Wed, 21 Apr 2010 15:00:51 +0100

 ----- The following addresses had permanent fatal errors -----
<me@mydomain.com>

 ----- Transcript of session follows -----
... while talking to mx5.mailshield.co.uk
>>> RCPT To:<me@mydomain.com>
<<< 550 Requested action was not taken because this server doesn't handle mail for that user
frosty1Asked:
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KrzyviewCommented:
You may want to check your rdns also you my want to check your nameservers. The next recommendation is to see if the server your email is being hosted on is dropping connectivity. The way to do this is using a free monitoring service on the net. Some are paid for but they constantly check your server to make sure a connection can be made.
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shauncroucherCommented:
Do you know where mx5.mailshield.co.uk is?

It appears that this server is being asked if it has the mailbox for your email address and the server is saying it isn't the server for your mail domain.

It sounds like DNS issue to me, check your MX records are set correctly.

command prompt:
nslookup -q=mx yourdomain.com

If you can post the domain all the better.

shaun
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frosty1Author Commented:
hmm interesting results. see attached image. My domain is "hallmedia.tv"
mx.png
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shauncroucherCommented:
OK, so what will happen here is that most mail with go to aspmx.l.google.com, but occassionally, if there is even the slightest glitch, it will go to mx1.123-reg.co.uk and will most likely bounce if the 123-reg server doesn't accept mail for your domain.

I'd remove the mx1.123-reg.co.uk entry and that should resolve the problem

Shaun
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frosty1Author Commented:
great, thanks so much. Excellent advice
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shauncroucherCommented:
Glad I could help,

Shaun
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