A: Hello h4mzza,

Thank you for your question and interest in SendFox.

It is good to know that we do not recommend using SendFox to warm up your database.
SendFox is not designed for determining which contacts are good for sending and which are not.
This is not allowed, as stipulated in our Terms of Service here: https://sendfox.com/tos.

We trust this will help.

With kind regards.