mail problem

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http://www.linuxquestions.org – hi sir i have centos5.3 i have mail server qmail toaster i can send /recieve mail from mail server but i have another server having varios application like bug tracker mantis,dotproject etc i already configured this application to send mail when any action is taken in this aaplication ,but from few days the mail are received from this application while normal mail from mail server is working i also check the smtp service on server on which application is installed is running pls suggest Thanks (HowTos)