Javamail是异步的还是同步的？
Javamail是异步的还是同步的？也就是说，如果我发送电子邮件，我是立即继续处理，还是等到它完成？
此外，有什么方法可以让我发现电子邮件因任何原因未能发送？
我还想知道 Spring 的 MailSender 抽象的这些答案。
谢谢。
Is Javamail asynchronous or synchronous? That is, if I send off an email, do I continue processing immediately afterwards, or do I wait until it's complete?
Furthermore, are there any ways that I could catch that an email failed to be delivered for any reason?
I'd also like to know these answers for Spring's MailSender abstraction.
Thanks.
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它是同步的，因为它将消息传输到服务器并在返回之前处理服务器的响应。
发送文档有更详细的解释。该消息将抛出SendFailedException或另一个MessagingException,如果发送立即失败。但“成功并不意味着消息已传递给最终收件人，因为在传递的后期阶段可能会发生失败。”
It is synchronous, since it transfers the message to the server and processes the server's response before returning. The
senddocs explain in further detail. The message will throw aSendFailedException, or anotherMessagingException,if the send fails immediately. But "success does not imply that the message was delivered to the ultimate recipient, as failures may occur in later stages of delivery."