This is basically a resurrection of https://forums.adobe.com/message/9165817#9165817
The accepted answer to that thread seems to be "Yes, Adobe is aware of this problem, and won't fix it." This means that Adobe's forums will never be able to send out any email notifications to mail servers that respect SPF records to protect against spoofing, and this includes my corporate email system.
I'll have to check back on this post because I won't be receiving any email notifications when someone replies to it.
I was actually just informed this was resolved (about an hour ago). Are you seeing the same results now?
Odd, I am still seeing the same results from the SPF Record Lookup I posted above, but that being said I actually did receive your topic reply notification in my mailbox.
So it's now working with my mail server, even though the SPF Record Lookup tool shows no change.