how to check that the email id exist in domain without sending any mails using java

问题

Is there any way to verify where the email id exist in domain or not?

I am having the following function: it checks only for valid domain, but i need to check for valid email address in domain without sending any mails.

 public boolean isValidEmailAddress(String email) {
   boolean result = true;

   try {
      InternetAddress emailAddr = new InternetAddress(email);
      emailAddr.validate();

   } catch (AddressException ex) {
      result = false;
   }
   return result;
}

回答1:

Here is a source code that could do many type of verification, I've been using it for years :

http://www.rgagnon.com/javadetails/java-0452.html

Note : see the function isAddressValid() in the page for full validation.

回答2:

Sounds like you need the SMTP VRFY command:

This command will request that the receiving SMTP server verify that a given email username is valid. The SMTP server will reply with the login name of the user. This feature can be turned off in sendmail because allowing it can be a security hole. VRFY commands can be used to probe for login names on a system. See the security section below for information about turning off this feature.

Note the security issues above though.

来源：https://stackoverflow.com/questions/13453160/how-to-check-that-the-email-id-exist-in-domain-without-sending-any-mails-using-j