Email Problems After Bandwidth Exceeded

I have posted a problem I had before after one of my sites exceeded its bandwidth cap (http://www.webhostingtalk.com/showth...threadid=77001), and the problem was solved through WHM's Unsuspend Banwidth Exceeders.

Anyway, now the people with sub-domains are experiencing e-mail problems. For instance, one of them cannot send e-mails but can receive them. I tried to reboot the server but that's not helping.

Anyone know what the cause if this problem may be? How can it be fixed? Thanks in advance.

 

 

 

 

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