Using Tiger (10.4.11) & Apple Mail. My home server suggested Port 587, but no help there from that. Diagnostics suggested changing to different server address, also no help. This problem happens whenever I travel away from home & do not use my home server. My home server says it is not their fault, but the fault of other servers who are blocking me. ????? Strangely, my wife is using a new Macbook Pro. (OS 10.5+) She uses same home server as I do, and does not have this problem. ???? Help Please!