My email address has 1 letter wrong but it will not let me change it. I am not receiving emails
1 letter is wrong in my email address and i don't know how to change it.
Mail.app > Mail > Preferences > Accounts > select the account > edit the error
Alternatively, remove the account (the minus at the bottom of the accounts column, accessible via Mail.app > Mail > Preferences > Accounts > select the account and then click the minus button at the bottom of the column to delete the selected account), and re-add it.