Simple WordPress Email Fix 2

We have a WordPress blog and when a user registers or retreives their password, the emails sent out are inappropriate. I want to remove "wordpress" from these emails, hardcode the EMAIL FROM, SUBJECT, and MESSAGE fields.? This is a simple project and I want this done? without changing database values and without using a plugin. User Registration Emails: 1) -----Original Message----- From: <wordpress@[login to view URL]> [mailto:wordpress@[login to view URL]] Sent: Friday, February 29, 2008 7:38 PM To: <admin@[login to view URL]> Subject: [OurBlogName] New User Registration New user registration on your blog OurBlogName: Username: testguy E-mail: <testguy@[login to view URL]> 2) -----Original Message----- From: <wordpress@[login to view URL]> [mailto:wordpress@[login to view URL]] Sent: Friday, February 29, 2008 7:38 PM To: <testguy@[login to view URL]> Subject: [OurBlogName] Your username and password Username: testguy Password: e764t80 <[login to view URL]> Forgot Password Email: -----Original Message----- From: <wordpress@[login to view URL]> [mailto:wordpress@[login to view URL]] Sent: Friday, February 29, 2008 7:43 PM To: <testguy@[login to view URL]> Subject: [OurBlogName] Password Reset Someone has asked to reset the password for the following site and username. <[login to view URL]> Username: testguy To reset your password visit the following address, otherwise just ignore this email and nothing will happen. <[login to view URL]>