Anything You Send via E-Mail Could Be Used Against You!
As a medium of communication, E-Mail is not secure. Sure, E-Mail is fast and convenient. Suppose you have sent e-mail to a friend which also contains personal information about yourself. Your friend could easily forward the e-mail to someone you would never have sent your personal information to yourself. This could be inadvertent but the damage is done. There is no UNDO command for this! Therefore assume that everyone can read your e-mails. Do not send confidential information via e-mail.
Offensive language, racist or discriminatory language also could end you up in trouble, even if you meant just humor. Remember the bottom line: Anything You Send by E-Mail Could Be Used Against You!