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Author Topic: Email not working - PHP 7.3+ - phpmailer issue with PCRE  (Read 114 times)

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« on: January 10, 2020, 08:25:34 PM »

I have discovered an issue with email working on PHP 7.3+ due to a bug with phpmailer and an updated version of pcre

Since phpmailer 5.2 is no longer supported and not compatible with PHP 7.3+ and pcre version 10.31 (or above). That version comes bundled with PHP by default

Lower versions of PHP use pcre 8.41 and this works.

Now where the issue lies is a function in phpmailer called validateAddress that checks if the email is properly formatted. Due to the new pcre libary, this doesn't work.

To fix it, there's two things that need to be done
1. As a workaround, you can just update the validateAddress function in the /lib/external/phpmailer/class.phpmailer.php file with the new function from the new version (per

- find the "public static function validateAddress" in the code
- delete the whole function
- replace it with the one from the new version

2. Nick may need to consider upgrading the phpmailer class to v6+ for greater compatability too
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