At some point, I received a spam email that came with the From address of my own email account. I marked it as spam. However, Mailgun, which I use for email forwarding, then decided my email address was a spam account, and stopped forwarding emails to me. Any legitimate emails sent to me did not receive failure notifications, they just disappeared. Thankfully, I was able to get this issue resolved, but it took about 28 hours for this to be the case.
So: if you sent an email to me (pat at freelancing-gods dot com) between 3:30pm Sunday 15th May AEST and 6:00pm Monday 16th May AEST, it never arrived. If you think it is important, please do send it through again!