Sadece iyi çalışıyor Bu PHP fonksiyonu:

if (preg_match ("/<(\S+@\S+\w)>.*\n?.*55[0-9]/i",$body,$match)) {
echo "found!";
}

içinde

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

xxx@hotmail.com
SMTP error from remote mail server after RCPT TO:<xxx@hotmail.com>:
host mx3.hotmail.com [65.54.188.72]: 550 Requested action not taken:
mailbox unavailable

But if I use the same php function içindethis case:

A message that you sent could not be delivered to one or more of its 
recipients. This is a permanent error. The following address(es) failed:

xxx@yahoo.com
SMTP error from remote mail server after end of data:
host d.mx.mail.yahoo.com [209.191.88.254]: 554 delivery error:
dd This user doesn't have a yahoo.com account (xxxd@yahoo.com) [0] -  mta1010.mail.mud.yahoo.com

preg_match function herhangi bir sonuç vermez. Ben yanlış ne yapıyorum?