$mail_to:可以是 user@example.com user@example.com, anotheruser@example.com User <user@example.com> User <user@example.com>, Another User $mail_from:可以是 或 User
$mail_to:可以是 user@example.com user@example.com, anotheruser@example.com User <user@example.com> User <user@example.com>, Another User $mail_from:可以是 或 User