Update: I now get the desired result, by ticking “Always pack as single parcel” on all the parcels.
Not sure if this is the correct method.
Thank you Bruna, I really appreciate your swift assistance.
I’ve managed to solve the issue. For anyone facing the same problem:
I’m not 100% sure if it’s related, but I was running the Newsletter task scheduler as a real cron. I switched it to MailPoet’s own script for a few minutes, and the message disappeared. Might be coincidence.
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This reply was modified 4 years, 3 months ago by dasherg. Reason: Mark as solved