How can compatibility issues between sendmail and qmail be addressed when using the mail() function in PHP?

Compatibility issues between sendmail and qmail when using the mail() function in PHP can be addressed by specifying the sendmail_path in the php.ini configuration file to point to the qmail sendmail wrapper. This ensures that PHP uses the qmail sendmail binary instead of the default sendmail binary.

// Set the sendmail_path in php.ini to point to the qmail sendmail wrapper
ini_set('sendmail_path', '/var/qmail/bin/sendmail');