I was having the same problem and solved it by going to Mail-click Mail in upper left hand corner-click on preference-look down the page to outgoing mail server-click the up/down arrow to open stmp selection and click on the one that corresponds with the email addr. you are using. For some reason this works for me. I was selecting AOL as my outgoing server but it didn't work.
I was having the same problem and solved it by going to Mail-click Mail in upper left hand corner-click on preference-look down the page to outgoing mail server-click the up/down arrow to open stmp selection and click on the one that corresponds with the email addr. you are using. For some reason this works for me. I was selecting AOL as my outgoing server but it didn't work.