Now there is a weird issue with my system. I am not able to figure out how the problem really started to appear. My system has Windows SBS 2003 R2 with Exchange SP2 . It is a new machine that I had recently configured. Now everything is working fine. I can receive emails but I am unable to send the same. When I try to send a message a error appear on the screen. The error is : smtp;550-Verification failed for sender. I am getting this message constantly while incoming mail is working well.
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