Blog Post
Just to be sure we are on the same page, the "reply-to field" and "reply field" are separate and distinct fields. Both are used in email communication to facilitate responses, but they serve slightly different purposes. The "reply-to" field allows the sender to specify an email address other than their "From" address for the purposes of replies. The "reply" function or "reply all" within an email client (like Outlook or Gmail) uses the "reply-to" address, if provided, to route replies. If no "reply-to" field is present, which is almost always the case, the reply goes to the "From" address.
So in order for you to demonstrate my use case, you would need to be able to send a notification to a QB user (i.e., the typical process) and when the QB user replies in their email client, the "To" field would be an e-mail value that is specified from a field in a record and that is not an email associated with a QB user account since it's EOTI. I'm 99% sure that this is not currently possible.
I was able to "dummy" it in with the attached e-mail formula URL. It's not as clean as an actual "Reply-To" option, but at least the QB user can respond to the EOTI user while retaining the gist of the original QB notification.
However, I'd love for you to prove me wrong.
Oh I'm sorry, I see what you're saying. While it is possible to include non-Quickbase users in the To field (like you would in Outlook), it's not currently possible to do so for the From field (and therefore, it's not possible to do so for the Reply To field either, since Reply To is automatically set to match the From field on the back end).
I like your mailto solution as a workaround, but can you log this as product feedback as well? (Click the ? in the top-right corner when logged into Quickbase, then click Give feedback).