我已经下载了这个验证电子邮件类：
http://www.phpclasses.org/browse/package/6650/download/zip.html
它大多运作良好。如果我试图测试：@ gmx / @ live-mail，它总是说：这封电子邮件不存在。但我知道它们已经存在（因为这些是我的电子邮件）。我现在不是真的为什么？如果我正在搜索@ gmx / @ live，我得到的信息是：
@live：
220 BLU004-MC1F11.hotmail.com Sending unsolicited commercial or bulk e-mail to Microsoft's computer network is prohibited. Other restrictions are found at http://privacy.microsoft.com/en-us/anti-spam.mspx. Thu, 21 Apr 2016 02:21:42 -0700
Connection success mx1.hotmail.com
HELO bla.is
250 BLU004-MC1F11.hotmail.com (3.21.0.236) Hello [217.13.193.253]
MAIL FROM: <blabla@bla.is>
250 blabla@bla.is....Sender OK
RCPT TO: <unicorncookie@live.de>
550 Requested action not taken: mailbox unavailable
RSET
QUIT
email <unicorncookie@live.de> does not exist!
@gmx：
220 gmx.net (mxgmx008) Nemesis ESMTP Service ready
Connection success mx00.emig.gmx.net
HELO bla.is
250 gmx.net Hello bla.is [217.13.193.253]
MAIL FROM: <blabla@bla.is>
250 Requested mail action okay, completed
RCPT TO: <unicorncookie@gmx.net>
550 Requested action not taken: mailbox unavailable
RSET
QUIT
email <unicorncookie@gmx.net> does not exist!
有没有人知道为什么这个课程无法到达邮箱？是因为我使用25端口？我从来没有这样做过，所以我真的很困惑
感谢您的帮助:)