problem with sending mails

hi there ive got a big problem guys, i have 10 emails that i set them up on my mac , and the problem is , the 3 of my emails are fake emails i mean İm not using them for bussines and İ have other ones to send important emails for important guys , so the problem is my mac some times send emails from my 3 of fake emails that no body dont know them and just get me angry after sending the email , when the guy REPLY me back, and İ saw *** thats the wrong email that the mac use , İ checked before sending emails that AM İ USİNG the right one , but it is compeletly about my mac and İ tired to get angry please HELP me ,

not: İ TRİED to inactive my 3 fake emails but STEEL got the same problem HELP ME PLEASE