I have 2 accounts on Windows Live mail. it asks me to sign in wuth my microsoft account details but then when I try to access one of the email accounts on an IMAP server r an smtp server depending whether they are ingoing or outgoing it seems- whatever that is- it asks for my password for that account. When I out my usual password in it sends me an error message

The message could not be sent because the server rejected the sender's email address. 

Subject 'Fw: [A_AG] detailed acupuncture needle order'
Server Error: 530
Server Response: 530 Authentication Required (VM401)
Server: 'smtp.blueyonder.co.uk'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 465
Secure(SSL): Yes

How do I create or change to a valid password to be able to send and receive on this email

[Original subject: windows live mail]