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Arinaya replied to the question Failed incoming mail error: (Does not have a valid Reply by Email header.) in the forum BuddyBoss Reply by Email 8 years ago
I’m having the same problem as the OP. I already had Sendgrid configured and working with a whitelabeled domain, using the SendGrid plugin.
The BB Test email is sent but the reply fails with the error: Failed incoming mail error: (Does not have a valid Reply by Email header.)
What do you suggest?