dear sir

yesterday evening one of my contacts received email from id , and these emails were not sent by me , and I cannot find any record in sent mails or deleted mails , I am surprised how this could happen , can anyone help on this and can anyone  advise how we can check the log details of email accounts.

secondly email id similar to mine has been created and mails are being sent from that id , the difference is so minute that my contacts don't realise that it is not my email id , how to solve this ? and can we find in anyway who owns that email id ??

thanks

suresh mehta