a new version of the plugin has been released and everything now works smoothly!
I just got an answer from the team. Tomorrow they will release a fix, otherwise -as someone else already did- it is possibile to downgrade.
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This reply was modified 6 years, 8 months ago by illaion.
I wrote them a message from within wordpress. Strangely Mailpoet 2 seems to work smoothly.
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This reply was modified 6 years, 8 months ago by illaion.