When I send a message, my personal information isn't correct
If your sent message in receiver's mailbox has incorrect information in a field From, it means that you have entered this information in your signature, which is used for outgoing messages.
To fix this problem you must enter your mailbox and go to Options. Then you must check your personal information in section Signature. More about editing signature see here.
If you were unable to find answer for your question, please write to firstname.lastname@example.org