Server not contacted on Port 587

Hello--This problem relates to the update of 10.4.7. Mail just fine before, repaired permissions before and after update. Used Mail and was not able to first send, error message (could not contact server on Port 25. Came to this forum and saw topics on possible problem with 10.4.7 update. Repaired permissions, reinstalled combo update, repaired permissions again, and now was able to receive email but could not send, was now getting error message that server could not be contacted on port 587. Have tried most of the solutions talked about here. Socks proxy off, moving Mail folder from Home Library to desktop, trashing plist. etc. We are able to send and receive mail using Netscape and my wife's school server. So the problem lies somewhere with Mail. Any new ideas on this problem with port 587. We count on Mail very much and getting it up and running would be great. Thanks for the help.
John

Sorry, This problem is with the iBook, have held off for the moment on updating the iMac.
John

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