Issue with email

[Jastjaga]

I have iPad2. I have few accounts set up to check the emails. However for one of my email accounts, it always show me a email address into "to" list, no matter where I got the email from. This email addresses is something which is nnever copied by the sender (as sender would not even know this email address). When I check the same emai on web(I.e. hotmail.com), that email address is not there. I tried deleting this account in iPad, but that problem does not go away. Any help would be much appreciated. Thanks in advance everyone for your help.