如何验证YMail，Gmail等中是否存在电子邮件地址？

Question

how do i validate Existing E-Mail Address.

in a Registration system, when a user enter a Email address it checks if the Email address is existing or not in Ymail/Gmail.

i already have a running domain(for Practice).

You have my regards.

Answer 1

SMTP provides VRFY and EXPN verbs to check if an account or mailing list exists. However, most server admins disable these verbs from their mail configuration to prevent hackers from exploiting user lists. Gmail and Yahoo are said to have VRFY disabled.

Another option you can try for these servers is emailing the user with a link to confirm their email address. Granted, it is not as sexy as realtime email verification, but it is more secure for all parties.