Couldn't open stream {imap.gmail.com:993/imap/ssl/novalidate-cert}INBOX Cannot connect to serve

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gmail 第一次使用imap，在后台设置开启IMAP功能，可能会遇到接收不到邮件，报错：

Couldn't open stream {imap.gmail.com:993/imap/ssl/novalidate-cert}INBOX      Cannot connect to server: Can not authenticate to IMAP server: [ALERT]

这是安全问题，需要验证，您登陆邮箱，然后访问http://accounts.google.com/DisplayUnlockCaptcha

然后点击继续，就可以了

英文参考：

I clicked the link (accounts.google.com/DisplayUnlockCaptcha) from my PC. It replied that my account was unlocked. Then when I tried the program again from AWS instance, it worked and now I can read gmail emails. This had to be locked from the beginning, but I don't know how my other servers (Netfirms and my PC) were able to read, but not AWS. One person guessed, because it was a new IP address that gmail blocked it right out of the gate.

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