[php-src] Issue #8086: Mail() functio nnot working in PHP 8.x

Issue: https://github.com/php/php-src/issues/8086 Author: hansherlighed ### Description The following code: ```php <?php mail("someone@example.com", "This is the subject", "This is the body"); >? ``` Resulted in this output of the DATA part of the communication from tcpdump on the receiving SMTP server when building container "FROM php:8.0.14-fpm-alpine" or "FROM php:fpm-alpine": ``` Received: by f3de6efeb3a0 (sSMTP sendmail emulation); Sat, 12 Feb 2022 06:28:10 +0100\r\n From: "Linux User" <www-data@f3de6efeb3a0>\r\n Date: Sat, 12 Feb 2022 06:28:10 +0100\r\n To: redacted@example.com\r \r\n Subject: This is the subject\r \r\n \r \r\n This is the Body\r \r\n \r\n ``` This is the output using the exact same environment, just that the container is build using "FROM php:7.4-fpm-alpine": ``` Received: by ae23725475da (sSMTP sendmail emulation); Sat, 12 Feb 2022 06:27:33 +0100\r\n From: "Linux User" <www-data@ae23725475da>\r\n Date: Sat, 12 Feb 2022 06:27:33 +0100\r\n To: redacted@example.com\r\n Subject: This is the subject\r\n \r\n This is the Body\r\n ``` The result is that when using PHP 8 the mail format is invalid and the headers are not processed correctly on the receiving SMTP server. I've tried using both sendmail and ssmtp in the container. It yields the same result. My php.ini setting are: ``` sendmail_path = '/usr/sbin/sendmail -t -i -S myserver:25' ``` Something has changed in the PHP mail() function between PHP 7 and PHP 8 ### PHP Version PHP 8.0.14 and newer ### Operating System Docker php:8.0.14-fpm-alpine and php:fpm-alpine