I just encountered the same issue described here. Essentially, a single incoming email is causing the entire queue to fail, preventing any emails from being processed.
From the logs:
Email can not be processed: Email::Receiver::EmptyEmailError
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:130:in `block in warn'[ ](https://github.com/rails/rails/tree/v7.2.2.1/activesupport/lib/active_support/broadcast_logger.rb#L130)
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `block in dispatch'[ ](https://github.com/rails/rails/tree/v7.2.2.1/activesupport/lib/active_support/broadcast_logger.rb#L231)
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `each'[ ](https://github.com/rails/rails/tree/v7.2.2.1/activesupport/lib/active_support/broadcast_logger.rb#L231)
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `dispatch'[ ](https://github.com/rails/rails/tree/v7.2.2.1/activesupport/lib/active_support/broadcast_logger.rb#L231)
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:130:in `warn'[ ](https://github.com/rails/rails/tree/v7.2.2.1/activesupport/lib/active_support/broadcast_logger.rb#L130)
/var/www/discourse/lib/email/processor.rb:183:in `log_email_process_failure'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/lib/email/processor.rb#L183)
/var/www/discourse/lib/email/processor.rb:29:in `rescue in process!'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/lib/email/processor.rb#L29)
/var/www/discourse/lib/email/processor.rb:16:in `process!'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/lib/email/processor.rb#L16)
/var/www/discourse/lib/email/processor.rb:13:in `process!'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/lib/email/processor.rb#L13)
/var/www/discourse/app/jobs/scheduled/poll_mailbox.rb:29:in `process_popmail'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/scheduled/poll_mailbox.rb#L29)
/var/www/discourse/app/jobs/scheduled/poll_mailbox.rb:49:in `block (2 levels) in poll_pop3'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/scheduled/poll_mailbox.rb#L49)
net-pop-0.1.2/lib/net/pop.rb:669:in `each'[ ](https://github.com/ruby/net-pop/blob/master/lib/net/pop.rb#L669)
net-pop-0.1.2/lib/net/pop.rb:669:in `each_mail'[ ](https://github.com/ruby/net-pop/blob/master/lib/net/pop.rb#L669)
/var/www/discourse/app/jobs/scheduled/poll_mailbox.rb:46:in `block in poll_pop3'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/scheduled/poll_mailbox.rb#L46)
net-pop-0.1.2/lib/net/pop.rb:531:in `start'[ ](https://github.com/ruby/net-pop/blob/master/lib/net/pop.rb#L531)
/var/www/discourse/app/jobs/scheduled/poll_mailbox.rb:45:in `poll_pop3'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/scheduled/poll_mailbox.rb#L45)
/var/www/discourse/app/jobs/scheduled/poll_mailbox.rb:14:in `execute'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/scheduled/poll_mailbox.rb#L14)
/var/www/discourse/app/jobs/base.rb:316:in `block (2 levels) in perform'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/base.rb#L316)
rails_multisite-6.1.0/lib/rails_multisite/connection_management/null_instance.rb:49:in `with_connection'
rails_multisite-6.1.0/lib/rails_multisite/connection_management.rb:21:in `with_connection'
/var/www/discourse/app/jobs/base.rb:303:in `block in perform'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/base.rb#L303)
/var/www/discourse/app/jobs/base.rb:299:in `each'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/base.rb#L299)
/var/www/discourse/app/jobs/base.rb:299:in `perform'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/base.rb#L299)
/var/www/discourse/app/jobs/base.rb:379:in `perform'[ ](https://github.com/discourse/discourse/blob/486ff2a5643f7a5ac66ccef11a97d6c2a282c9ee/app/jobs/base.rb#L379)
mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:137:in `process_queue'[ ](https://github.com/discourse/mini_scheduler/blob/master/lib/mini_scheduler/manager.rb#L137)
mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:77:in `worker_loop'[ ](https://github.com/discourse/mini_scheduler/blob/master/lib/mini_scheduler/manager.rb#L77)
mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:63:in `block (2 levels) in ensure_worker_threads'[ ](https://github.com/discourse/mini_scheduler/blob/master/lib/mini_scheduler/manager.rb#L63)
This seems to be a recurring issue, and it would be great to get it fixed. At the very least, the process could be streamlined to handle such cases better. For example, by isolating the problematic email so the rest can still get processed. It might also help to include a warning in the Admin Dashboard, similar to the one shown for outgoing email issues.
I can provide the email body in PM, just let me know. Thanks.