Lesson I learned early in my career, luckily not on my own: never write something that you really don't want someone to see, especially bosses and clients and especially swearing.
Mails are replied to, mails are forwarded, long chains of emails happen, your stuff gets out.
A colleague at one of my first work places made fun of a client. 10-20 replies and forwards later, his mail was sent to a client. Luckily I think his message was buried too deep in the resulting mail and the client didn't see it.
I did, though, as did several people from my team. We didn't say anything but we all learned a lesson that day :)
Mails are replied to, mails are forwarded, long chains of emails happen, your stuff gets out.
A colleague at one of my first work places made fun of a client. 10-20 replies and forwards later, his mail was sent to a client. Luckily I think his message was buried too deep in the resulting mail and the client didn't see it.
I did, though, as did several people from my team. We didn't say anything but we all learned a lesson that day :)