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Smtp mail not being received

We have a strange problem. We use the Symantec SMTP gateway ver 3.1 for all incoming and outgoing emails. We have received complaints from different users that they are not receiving emails from certain email addresses. When we investigated we found that mail from domains starting with " x " are being bounced back , there are three domains we have identified based on our user feedback .. they are xerox.com, xpertlearning.com and xtra.co.nz.. These are the ones reported but it is quite possible that all domains starting with "x"are getting bounced.

Has anyone come across this problem and what is the resolution to this.?

2 Solutions
Are you doing domain filtering ?  
Possibly filtering out XXX domains, but the filter is blocking all domains starting with X ?
pintoa2000Author Commented:
Here is the error that we get on our smpt gateway log when receiving mail from the domains as mentioned earlier.. i.e the domain names starting with x

Info: Permanent error involving remote host.  Info2: 550 Mail from rejected  
OK, that message is telling you that the incomng E-Mail is being rejected during the MAIL FROM: portion of the initial SMTP conversation.

Like flyfreak, I would suspect some sort of filtering rule that is too broad. I would examine the Symantec configuration and look for rules/settings that block mail from a given Domain, especially ones that use templates or wildcards to define the rule.
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it would be configuration which blocks all the domain that starts with xxx such as www.xxx.com will be blocked, and it happens to be on the setings you have somehting like that as a wild card

that is my quess anyway
I thot I said that.
pintoa2000Author Commented:
There was a filter in our Groupwise internet agent for blocking all incoming email from x*

Wonder who put it there.. time for a good change management system.. any ideas.?

Thanks a lot
My best idea is to limit access to that portion of GroupWise. It may be easier to do this if the GWIA is in a Secondary Domain and on a separate physical server.

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