Today, @smcalear informed me that emails she was sending to our Discourse instance were no longer showing up.
I checked some things out and found the following:
Nothing I know of changed on the system between when it was working (12 noon) and when it was observed to no longer be working (12:30 pm)
The emails are being sent to the correct address firstname.lastname@example.org
The gmail inbox we're using for email in is still being polled successfully.
It is set up to "archive emails" after they are accessed via POP, and indeed, the emails in were getting archived.
https://ourforum.com/admin/email/received does not show any of the new emails
https://ourforum.com/admin/email/rejected does not show any of the new emails
https://ourforum.com//logs does not show anything suspect
Any ideas about what could be going on or where to look next?