This happened in my work when we had our SSL renewal reminders going to our helpdesk email. Problem arose when an SSL reminder came in once and our new helpdesk operator assumed the reminder was also sent one of the member's of the IT team or that it was some form of spam because he'd never been told otherwise.
When we chose the helpdesk email address for our SSL renewal, we were thinking along the lines that the helpdesk operator would pass the support call as a second line incident, like with other second line incidents, using our 'support call tracking' portal to a member of the second line team.
Big oversight on our part, though we partially felt the helpdesk operator should've either known better or come and asked us what to do. We never forgot anything like that again, as we started using a calendar and allocated that it be one person's task to do this in the future, and that a second person's calendar should remind them to verify it's done.