wp-mail 500 Server error

Hi,

I’m trying to blog by email using my mobile phone as the source.

Step 3 of the Codex tells me to activate my blog by:
https://example.com/installdir/wp-mail.php

which in my case is https://harounkola.com/blog/wp-mail.php

but when I do this I get a 500 server error, and the message is:

Server Error
The following error occurred:

[code=SERVER_RESPONSE_CLOSE] The server closed the connection while reading the response. Contact your system administrator.
Please contact the administrator.

Please help me.

Thanks
Haroun