AppleMailServer DNS

Getting the following response from the mailserver: There may be a problem with the mail server or network. Check the settings for account ìchesson.netî or try again. The server error encountered was: The server ìmail.chesson.netî can not be contacted on port 143. I have checked all that I can think of. The Server setting seem to be correct. I have installed v 10.2.4. Is there anything changed in the new version that would cause this problem? Syd Chesson :roll: