ping 请求超时
12 企业邮箱发送邮件时,若出现投递失败产生退信,内容提示包含如下: the mta server of * reply:550 failed to meet SPF requirements 或者 the mta server of 163.com — 163mx01.mxmail.netease.com(220.181.14.141) reply:550 MI:SPF mx14,QMCowECpA0qTiftVaeB3Cg—.872S2 1442548128 http://mail.163.c...