Sorry, is TL, but humbly think is worth to read.
Last Friday:
Coworker: Hey, our mail is being redirected to our client's spam folder. What did you do?
Me: Sorry, but I have no control over that.
Boss: I happened to me also. Something is wrong with our mail server.
Me: I'll check, but this is really out of my control.
Rushed to my station... domain blacklist check...Fuuuuuuuu! We been blacklisted! What in the fucking damn hell happened?????!!!
Mail server log check....Mmmm...WTF is this shit?
Devilish grin in my face....muahahahaaa! Your ass is MINE!
So, my "I know everything" new coworker ( https://www.devrant.io/rants/193238 ) used his account to send over 6300 messages a couple of times over a period of 4 hours. By our boss request we have no limit on our servers...
Gotcha! I'm going to get your ass fired!
(BTW: The pic is Gotcha the Cockatoo)