Hi there's been a cycle where a mailer daemon responded to a JIRA ticket because of an "undeliverable" notification and this response caused a new comment creating a new mail to the same failing address ...
Over the course of the day I've been wading through the comments, deleting them one by one. I thought JIRA notifications had been going to a special "issues" list and never thought I'd be spamming more people than just myself and Dominik. I'll stop deleting the comments immediately. Sorry for the noise Stefan