Thank you for your suggestion.
I run the scan, port 25 is blocked with firewall active and closed with firewall open.
Anyway I didn't want to run a mailserver on my pc, I simply wanted to use a public mailserver to send email by php function.
On another PC, with a previous version of Apache-PHP suite, I also got after the scan the port 25 blocked, but the same I'm able to send email by php simply
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