Are there any specific PHP settings or configurations that can affect the formatting of emails sent via the mail() function?

When sending emails via the mail() function in PHP, the formatting of the emails can be affected by the settings in the php.ini file, particularly those related to the mail function. To ensure proper formatting of emails, you may need to adjust settings such as the sendmail_path or SMTP server configuration.

// Example of setting the sendmail_path in PHP code
ini_set('sendmail_path', '/usr/sbin/sendmail -t -i');