我用163的邮箱，发给@mail.ru，得到的系统退信如下，请各位强人帮忙分析一下，另，如果改用hotmail的邮箱是不是可以发送，请推荐一个不会被退信的邮箱。谢谢！
This message is generated by COREMAIL email system.
I'm sorry to have to inform you that the message returned
你发送到
****[email=****@mail.ru]
@mail.ru[/email]的邮件由于以下原因被退回 :
****[email=****@mail.ru]
@mail.ru[/email] SMTP error, RCPT TO: 550 Access from ip address 220.181.**.**blocked. Visit
http://win.mail.ru/cgi-bin/support_bl?ip=220.181.**.**
