The Horrible Job lost a day because The Horrible Challenge Department fucked up. So The Horrible Boss decided to forward the department head email wherein department heads were told our off days went from Thursdays to Tuesdays and that they should forward the email on to their departments. To everyone. But she highlighted the TO: and not the message, thereby forwarding EVERYONE a list of EVERYONE's names. Then she sent a message to EVERYONE telling us to read the stuff below, but didn't actually attach any stuff below. Then she sent a blank message to EVERYONE. Then she finally sent EVERYONE the two line email that the eight department heads had gotten three hours previously, and had forwarded to everyone in their department two hours and 55 minutes previously. Then she forwarded it to EVERYONE AGAIN to make sure we'd received the email. It was like watching an elephant on an ice floe. Best part is that everyone on set knew about the change three hours before the meeting even happened. thankgodshedidn'ttextittous
This has caused email servers to fail and make national news. I have a script that delays internal emails with more than x recipients, sends me a note and lets me manually intervene to prevent stuff like this.
I think you will enjoy this: https://www.reddit.com/r/talesfromtechsupport/comments/420oan/companywide_email_30000_employees_autoresponders/ Hehe.
That looks like a nightmare from the infrastructure side.