Reply to Re: very disturbing..
If you don't have an account, just leave the password field blank.
As Simeon pointed out, sending email posing as somebody else is extremely simple. I can even send mail using my very own computer as the mail server, on which I can pose as anybody for any reason I see fit. This is what spammers do. It's due to the fact that the email protocol was never originally intended for world-wide use, just for local networks, and thus spoofing of addresses never seemed a problem. All of a sudden, everybody started using it, and it never had a chance to be updated to be safe against these "attacks".
There are ways to overcome this issue, however, it requires the use of external technology. Myself, I use OpenPGP to electronically sign my mail when I send it (Using Thunderbird+Enigmail) so that anybody who gets mail from me can VERIFY that I was indeed the originator. I also make a point of this in my email signature, so people are aware of it.
If you're interested, you can read about it here.
There are ways to overcome this issue, however, it requires the use of external technology. Myself, I use OpenPGP to electronically sign my mail when I send it (Using Thunderbird+Enigmail) so that anybody who gets mail from me can VERIFY that I was indeed the originator. I also make a point of this in my email signature, so people are aware of it.
If you're interested, you can read about it here.