I found out, that the current mailpoet integration with data submission seems not to work proper, as the collected emails are properly submitted but the first and last names were not filled out within mailpoet subscriber profile. That is why I am unable to personalize the newsletters currently.
Here are the versions I use those are the latest I guess.
Screenshot > https://www.screencast.com/t/b436kQEE6ZoO
Leads Version 3.2.2
MailPoet 2 Version 2.8.1
Inbound Extension – Mailpoet Integration Version 1.0.9
I also checked the IP block of your IP but there is no block to be found within WP all in one security plugin. If you get blocked, you get the possibility to send an unlock request by using your email.
Hope this helps!
P.S. If you still getting issues with IP block I will temp deactivate the all in one security plugin, but this may cause then a protection issues.