Can not send email - port 25

Hello. I really hope somebody can help me. I bought my first Mac. And I can not get port 25 (out going mail port) to "open". I am using Microsoft Entourage (version 11.3.3) as a multi-mail program.
The only informations that I got on the router is the following:
Zyxel
Model no.: 401490
SN: S060Z34059219
Mac: 001349CE88D7
I am a beginner and this issue might be a small problem to fix for the most users of Mac but I have no idea hve to solve this problem. Please help me someone...

I'm not sure I understand the question.
It seems to me that Sympatico.ca are requiring you to use port 587 with SSL and authentication for all outgoing mail, right?
So what's the problem? You can't force your system to use port 25 if your ISP isn't supporting that.

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