A: Hi kaido,

Thanks for your interest in Mystrika.

We will need more info before we can comment on it.
Reason being, free major ESP's (like Gmail) IP are almost never present in Blacklist (due to their high reputation), and free ESP's domain (like Gmail.com) are also never Blacklisted because well, who is going to blacklist Gmail.com

So, question remains what Blacklist are we talking about here?

Mystrika has one strict rule on warmup system.
Emails to your email id should not be bouncing, if they bounce, Mystrika will detect it and automatically de-activate your email id.