java邮件存储类型"imap"与"imaps"的对比 [英] java mail store type "imap" vs "imaps"

问题描述

我正在使用以下代码以编程方式验证电子邮件.

I am using the following code to validate an email programatically.

Properties properties = new Properties();
Session emailSession = Session.getDefaultInstance(properties);
Store store = emailSession.getStore("imap");

store.connect(host, user, password);
if(store.isConnected()){
      System.out.println("true");
 }

当前会引发异常

javax.mail.MessagingException: Connection dropped by server?;
nested exception is:
java.io.IOException: Connection dropped by server?
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:670)
at javax.mail.Service.connect(Service.java:295)
at javax.mail.Service.connect(Service.java:176)
at com.**.channel.type.IMAPValidator.fetch(IMAPValidator.java:23)
at com.**.channel.type.IMAPValidator.main(IMAPValidator.java:47)

但是，如果我使用

emailSession.getStore("imaps");

然后成功连接到YAHOO的imap服务器.

then it successfully connects to imap server of YAHOO.

我所知道的"imaps"代表安全".

What i know "imaps" stands for "secure".

我不知道为什么我不能简单地使用"imap"?

What i dont know is why I cant simply use "imap"?

推荐答案

Google确实需要安全连接.

Google does require a secure connection.

https://support.google.com/mail/troubleshooter/1668960?hl = zh-CN#ts = 1665018％2C1665144

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