Check if isp has port 25 opened or blocked

My isp in Mexico recebtly blocked port 25 to avoid email abuse. It opens it selectively after you make a formal request.

One of my clients (with this isp) say it has opened port 25 but is unable to send email with outlook configured with his domain and port 25.

How can I check whether my client has port 25 blocked blocked or not?
robrodpAsked:
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