If you need to contact support about issues with your user account, you do not need to tell me your password, and you definitely shouldn't be sending it to me in a plain text email. I am root. I have the power.
If you're a developer who is programming systems which are meant to have security in mind at all times, I really, really shouldn't have to tell you this. And yes, I am going to force a password change every time you do it. What sort of shoddy programs are you developing that you need this explaining?
<and breathe>