Many people don't and your message can end up being delivered to a complete stranger. Or maybe even someone you DO know but was not intended for them. Don't share an email account with anyone. Don't give out your password under any circumstances. Email accounts at work can be easily monitored.
Messages stored on centralized servers and mainframes have a tendency to hang around for years .
For this reason it's unwise to use your work account to send or receive personal or sensitive material. Most companies have in-house experts that can easily retrieve messages you thought you had deleted. Again, take extreme caution. Because email messages are simple text files, they can be easily forged, altered, or read by anyone at just about any time without leaving any evidence. These are every bit as easy to use as your regular account and a lot safer.