Another solution for mail in PHP

Some time ago I came into contact with DEC Tru64 UNIX. I installed PHP + Apache on it. I could use the provided mail function to send emails normally, so I compiled a function, it uses UNIX pipelines and PHP sock functions to send emails. The experiment was very successful. below is the original function. Code .
Function mymail ($ MTO, $ MCC, $ msubject, $ mbody)
{
$ From = "webmaster@backhome.com.cn ";
$ Sign = "\ n"; // whatever you want
$ Sendmailpath = "/usr/lib/sendmail"; // semdmail path
$ Bound = "=======_". uniqid ("bcfmail"). "==_"; // delimiter
$ Headers = "mime-version: 1.0 \ n ".
"Content-Type: multipart/mixed; boundary = \" $ bound \ "\ n ".
"Date:". date ("D, d m h: I: S Y"). "\ n ".
"From: $ from \ n ".
"To: $ MTO \ n ".
"Cc: $ MCC \ n ".
"Subject: $ msubject \ n ".
"Status: \ n ".
"X-status: \ n ".
"X-mailer: My email interface \ n ".
"X-keywords: \ n ";
$ Content = "--". $ bound. "\ n ". "Content-Type: text/plain; charset = \" gb2312 \ "\ n ". $ mbody. $ sign. "\ n ";
$ End = "\ n". "--". $ bound. "-- \ n ";
$ Sock = popen ("$ sendmailpath-T-F 'webmaster @ backhome.com.cn '", 'w ');
Fputs ($ sock, $ headers );
Fputs ($ sock, $ content );
Fputs ($ sock, $ end );
Fputs ($ sock, ". \ n ");
Fputs ($ sock, "Quit \ n ");
Pclose ($ sock );
}