got response code 550, with response: 550 Connection frequency limited 的解决办法
今天发送一个代码后，发现如下的信息，字面意思很容易理解：连接频率超过上限。其错误的代码信息如下：550 Connection frequency limited DEBUG SMTP: got response code 550, with response: 550 Connection frequency limited RSET 250 Ok DEBUG SMTP: MessagingEx