Sendmail & MTA refusing connections with Puremessage

This is more of a reminder for me than anything else. If sendmail MTA starts refusing connections, it's probably because you have a lot of messages in the mail queue that are undeliverable, and are taking their time timing out. The refusal is caused because the sendmail demon is trying to run it's delivery queue too many times over the course of an hour - you probably have -q5m or something on sendmail's command line (process the queue every 5 minutes), change it to -q30m (30 minutes).