Hi all -
We have a game which uses email authentication for player accounts for data backup and retrieval. We currently are not sending an initial verification email, but we are using SMTP for password recovery.
The reason we stopped using STMP for the initial email verification was because the volume of broken or erroneous emails that users were putting in caused gmail to flag our account for spam violations. I believe at the time we were using a basic email-formatting-check to verify that the address adhered to basic formatting, but we didn't run a more extensive check before kicking off the email to SMTP. When I download run our email list through an email list service, we're seeing fairly high numbers of bogus emails or typos, and that's why we're triggering the fault with google.
How are other people dealing with this issue? Are there particular pre-checks you do before sending to SMTP? Or are you using an SMTP service that doesn't care if the email is valid or not (and if you do this, is there a risk of being blacklisted?)