How to send validation email without going into the spam folder?

Question

I have a PHP website that send a validation code when a new account is created.

My problem is since few months, a lot of those email goes in the spam folder.

I t

Answer 1

Try using your ISP's or company's server as a relay. Use a sending address which exists, so that validation can be done on it, and bounces sent back to it. You may want to setup a separate domain for verification such as verification.example.com. You could then send the validation message from application@verification.example.com. Replace application and example as appropriate.

You may also want to look at https://serverfault.com/questions/241189/email-delivery-management-grievances#241260.