Hi frieds . while sending email using xmail server i am getting this error. what is this error .. how to solve this problem

"The CLR has been unable to transition from COM context 0x1a0738 to COM context 0x1a08a8 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations."