Ask them to check for any incoming e-mail scanner running on their local machine. If so, ask them disable the same. Also check the .qmail file in the user's folder for any duplicate entries.
Regards, Prasad Asokan 2009/9/11 Bulend Kolay <bma...@ihlas.net.tr> > I use vpopmail on qmail. > > I have many customer domains on that mail server. > One of these customer domains tells me that, they rarely receive the same > mail a few times. That problem becomes nearly once a week for this > customer. > I haven't any complain from my other customers. > They use outlook or o.express for their mails. > What may the problem be ? > > Do I have to change my configuration ? > > > > !DSPAM:4aaa31f632719500116850!
