My personal and work email addresses are very similar,
firstname.lastname@example.org. About a year ago I temporarily lost access to my company email address and communicated with a coworker from my personal address while IT sorted it out. I got back up and running, no problems.
Recently, that coworker sent out an internal email to many coworkers, and accidentally sent it to my personal email address instead of my work email address. It happening once is no biggie, I can forward it to myself and get on with the day.
The problem is that my personal email address is now in the contact books of all the recipients. And now it might be included in group emails, shared with new people, and on and on, spreading like a virus.
I caught it within the hour and was able to send out a mass email asking everyone to remove the personal address from their contact books, so far everything seems fine.
How could I have handled this better? How could I have handled this if it had spread to senior management or even the customers?