Third Question

You should run them first against our ValidateEmailAddress operation. Then wait an hour or so and take the ones that had unknown values in the SMTP level checks and run them against the ValidateEmailAddress operation with a lower timeout value. This should get nearly all of them. Continue this until all the emails have data for the SMTP level checks. The more you submit an email, the better the chances are that our background processes will be able to process it. Our system improves with use.