can anybody tell me please that we are an SME and we are able to send mails from our company's respective ID but we are not getting mails on our respective ID'splease help as what may be the general causes and any good trouble shooting books that we can refer to eliminate this problem.

Hi, It seems that this issue is related to Exchange Server. I suggest discussing it in our Exchange Server forum. http://social.technet.microsoft.com/Forums/en-US/category/exchangeserver/ I hope your issue can be resolved soon. Tim Quan - MSFT