php Send mail about problem: Mail sent, return to invalid address

php Send mail problem: Message sent, return to invalid address:
:
Why is there such a situation?
------to solve the idea----------------------
Public Function addaddress ($address, $name = ") {
return $this->addanaddress (' to ', $address, $name);
}

Private Function Addanaddress ($kind, $address, $name = ") {
if (!preg_match ('/^ (to
------to solve the idea----------------------
Cc
------to solve the idea----------------------
Bcc
------to solve the idea----------------------
ReplyTo) ($/', $kind)) {
Echo ' Invalid recipient array: '. Kind
return false;
}
$address = Trim ($address);
$name = Trim (preg_replace ('/[\r\n]+/', ' ', $name)); Strip breaks and trim
if (!self::validateaddress ($address)) {
$this->seterror ($this->lang (' invalid_address '). ': ' $address);
if ($this->exceptions) {
throw new Phpmailerexception ($this->lang (' invalid_address '). ': ' $address);
}
echo $this->lang (' invalid_address '). ': ' $address;
return false;
}
...

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