[KK]

@olliwalli, any errors you see being reported in the server log?

@KK: Thanks, I found the error: emailex.php produces additional newlines in the $header. So it was not accepted by the php mail function. I corrected it by replacing every occurrence of "\r\n\r\n" with "\r\n". E.g.:
Old:

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$header .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";

New:

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$header .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n";

And also replacing

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$header .= $content."\r\n\r\n";

with

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$header .= $content."";

Then it worked.

[KK]

Thank you very much for sharing the solution @olliwalli