问题
Possible Duplicate:
How to check if an email address exists without sending an email?
I was wondering : is there a way to check if an email address is Correct and it Exists before sending an email, using Telnet or SMTP Protocol cmd-line ?
回答1:
The only valid solution to detect if an email address exists is to send an email and wait for answer.
Most of the times you also want to be sure that your user is the owner of the account, and this solution does both checks.
You can't do this client-side only, you'll need a server-side API.
来源：https://stackoverflow.com/questions/14102414/how-can-i-check-if-an-email-address-is-correct-and-exists