[@casiepa Moderator 10 years, 11 months ago]

Hi,

You use ‘WP SMTP’ ? It seems not updated for over a year and compatible up until 3.9 only. I would propose to find an SMTP log tool to see all outgoing messages that the headers are correct. Or switch to a newer SMTP like Postman.

You are 100% sure the users are subscribed to the forum ? If you’re unsure, consider bbP Manage Subscriptions to check who is subscribed to what forum.

Pascal.