Hello,
I have got the same problem:
I signed up for a free account (< 1000 subscribers) but a few days later MailPoet still states:
Note: your account is pending approval by MailPoet.
Rest assured, this only takes just a couple of hours. Until then, you can still send email previews to yourself. Any active automatic emails, like Welcome Emails, will be paused.
My site is http://www.hergegenootschap.nl
Do yue need my e-mail adress?
Thanks!