[wp-trac] [WordPress Trac] #39753: wp_mail() under PHP 7 hosted on Windows creates malformed email messages

[WordPress Trac]

#39753: wp_mail() under PHP 7 hosted on Windows creates malformed email messages
-------------------------------+--------------------
 Reporter:  Andy Schmidt       |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  4.7.3
Component:  Mail               |     Version:  4.7.2
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
-------------------------------+--------------------

Comment (by Andy Schmidt):

 To avoid the possibility of side effects with legacy Linux mailers that
 might mangle RFC compliant line endings, you could either use the
 operating system line-end as the default value, e.g.:

   $phpmailer = new PHPMailer( true );
 <<insert here>>
   $phpmailer->LE = PHP_EOL;

 In essence, you would leave the default of \n in place for Linux, and
 would only change it to \r\n, which is proper for SMTP, which is the
 method used by Windows.

 You could also make it operating system dependent, if you prefer:

   $phpmailer = new PHPMailer( true );
 <<insert here>>
   if ( stripos(PHP_OS, 'WIN') === 0 ) {    // Windows uses SMTP, mandating
 RFC compliant line ending
        $phpmailer->LE = '\r\n';
        }

 Explanation: Linux implementations are not affected by the change in PHP 7
 because they launch command line mailers which have always been prepared
 to accept lines terminated by \n (their operating system default) as
 input. Those mailers will output proper \r\n when mailing anyway.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39753#comment:4>
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