problem between postfix and xp
I have a Mandriva2006 box with postfix installed on it. and everything is running smoothly. my workstations are a mixture of win2k and winxp pro. the problem that i have is that while the win2k clients connect to the server to dowload their mail fine, the xp machines take about 30 seconds to "send and recieve" and then they go thru, they don't get a time out, they just take long. i have done a tcpdump and check all the logs that i can think of but i don't see anything funny. if anyone could help i would really appreciate it.