What Meaning and follow "550 Message does not pass DomainKeys requirements for domain ..."


I'm got my email recipient similiar feedback when they send email to me.
"550 Message does not pass DomainKeys requirements for domain ..."

Have any command or method to verify above mentioned reason - "Our email server check the sender email server" Acutally, the sender can email to me throug Gmail. Is say Gmail system will not applied this "Checking" setup

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Dave BaldwinFixer of ProblemsCommented:
Read here http://en.wikipedia.org/wiki/DomainKeys   Yahoo uses it to detect and delete spam as do some others.

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SamuelLam1997Author Commented:
May I to know the solution method, either on our server side ir other way.

Dave BaldwinFixer of ProblemsCommented:
The error message is telling you that your domain was not verified for some reason.  Go to http://www.mxtoolbox.com/ and enter the domain name that is used to send your email.  You will get a lot of information about it like whether it is listed as a source of spam.  Check for SPF.  If you don't have it, go to http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/ and create it to put in your nameserver records.  Fix any other mail server problems you find at http://www.mxtoolbox.com/
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SamuelLam1997Author Commented:
Hi, Dave

Could you help me to varify the email server for  "traveller.com.hk". user can't send email through this server to our emails server "cttlhk.com"

The sender will got email response '550 Message does not pass DomainKeys requirements for domain "

Thanks for your kindly helping.

Dave BaldwinFixer of ProblemsCommented:
The only discrepancy I found was that the PTR record did not return your domain name.  It comes back with .  Everything else looks just my domain name.
SamuelLam1997Author Commented:
Hi, Dave

I'm not experienced on you mentioned statement. Could you tell the reason which why user can't send email throu traveller.com.hk  to our domain cttlhk.com.

Thanks a lot.

Dave BaldwinFixer of ProblemsCommented:
Because of this:

220 hkitec.net ESMTP
OK - resolves to
Warning - Reverse DNS does not match SMTP Banner

'hkitec.net' in the initial 'banner' does not match the Reverse DNS of  they need to fix that.
Dave BaldwinFixer of ProblemsCommented:
And your domain has the same problem.

220 cttlhk.com ESMTP MDaemon 9.5.6; Mon, 19 Mar 2012 17:32:27 +0800

 OK - resolves to citizenthunderbird.com
 Warning - Reverse DNS does not match SMTP Banner
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