The way the password is saved is by one-way encrypt method. You encrypt the password, and it can't be unencrypted back.
Then when you enter you password, it is encrypted the same way (producing the same encrypted string) and if it matches, boom you're connected.
Now there is no way to get the original password from the encrypted one (generally with MD5, can be others), so hen he will move to the other server, everything but the password will be saved, so your email address should be valid to send back a password reset request.