I'm wondering if anyone has insight on this Help article:
Replies Do Not Go to the 'Reply-to' Address Set for Account Engagement Emails
We're setting up Account Engagement with email subdomains for sending, but the subdomain addresses don't actually exist yet. Has anyone had this experience where a reply goes back to the sending address rather than the reply-to?
François Perret (Bamsoo) 
Forum Ambassador
Hi Stephanie,
As the article puts it, the Reply-To directive is not guaranteed to be honoured by the final recipient client. So you actually take the risk of receiving answers to non-existent inboxes which will result in a bad experience for your answerers.
You should use existing adresses as senders, no workaround I believe.
Hope this helps 😎.
#SharingIsLearning #AccountEngagement
François.
