邮件发不出，说是疑似垃圾邮件
发一封邮件，老是出错，系统回复的英文说是疑似垃圾邮件，用了gmail和yahoo的邮箱发都是系统回复的这个信息：
This is an automatically generated Delivery Status NotificationDelivery to the following recipient failed permanently:Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 Sorry, message looks like SPAM to me (state 18).
雅虎的：Hi. This is the qmail-send program at yahoo.com.
I'm afraid I wasn't able to deliver your message to the following
addresses.This is a permanent error; I've given up. Sorry it didn't work out.
210.51.54.14 failed after I sent the message.
Remote host said: 554 Sorry, message looks like SPAM to me
请问这怎么解决？我用附件一个文档发了不行，就用的直接复制过去的文字发还是不行.回答为:是不是对方邮箱已满,打个电话通知她看一下.