The most recent change in POP3 polling happened in January.
That alone shouldn’t stop Discourse from polling, but it’s possible that an incoming email raises an exception. There’s no error handling in the new code…
@jzedlitz Are you still seeing the problem and want to help get to the bottom of this? Are there any related errors in /logs? Do you see an error in /sidekiq/scheduler when you search for Jobs::PollMailbox? Do you see an error when you manually poll in the rails console?
./launcher enter app
rails c
Jobs::PollMailbox.new.execute({})