Yahoo issue?

"Mail servers are usually configured to not inform which addresses are valid to untrusted parties, as that would allow them to clean spammer lists to prune invalid addresses."


So far i know Yahoo is the only one that have issue. I have tested many others mail servers and not any of them have issue except Yahoo.

And i still would like to see just one single site or IP address who use this script and that do not have issue with Yahoo.

Thanks

Practically all servers that use qmail (just to mention one popular type of mail server) will accept messages for invalid addresses and only bounce them later.

Anyway, this is an Open Source script. You can analyze the source and see that it only does SMTP protocol like any other e-mail validation component. If you feel that this component is not doing anything right to make it not work with Yahoo as you desire, you are free to study the code and tell where is the problem.

I have finally found what is issue with Yahoo. It does not have anything to do with server or your domain name but they way how yahoo response to request.

If you would like to verify any Yahoo username then email must be really send to Yahoo. No matter of it is good or bad username.
When sending of email is finished then Yahoo will response with Ok or Bad and give right response like any other email.

Disadvantage is that script must be modified in such a way that send every time really test email to Yahoo username email. In the way how script works right now it will always response with OK (what is wrong) because verification is not possible without sending email.

Yes, many e-mail servers work like that. There is nothing that can be done about that because this is just a test, not an actual e-mail delivery.