Incoming Server (POP3) - 110
Outgoing Server (SMTP) - 25
okay so now don't change anything at outlook level, just close the application if it's opened, re-activate the mail shield, go to expert settings there, and delete all entries in "ssl accounts" if any. Deactivate also automatic detection of ssl accounts. Validate, and launch outlook again. Please report to tell if it's alright now.
ps: if the above doesn't work, you also got some outlook options in the mail shield advanced settings, try to check/uncheck and see if that changes anything. But obviously these should remained checked.