We're sorry, but your email message to ["users@rust-lang.org"] (titled new topic test) didn't work.
None of the destination addresses are recognized. Please make sure
that the site address is in the To: line (not Cc: or Bcc:), and that you
are sending to the correct email address provided by staff.
Yes, below. From your hint I tried to update ‘custom incoming email’ address for ‘uncategorized’ to ‘users@rust-lang.org’, but after clicking ‘save’ the setting did not seem to take.
Wow, this bug was affecting all the fields in the Settings tab for “uncategorized” category. The fields were not showing as updated when opening in edit mode. Sent a fix