I am trying to reply to an email and keep getting the following error message, I have re-booted my modem (I have had NBN problems recently) but this has not resolved the problem. What do I need to do to fix this problem?
The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was 'email@example.com'. Subject 'Re: SWA Financial Planning - Review Update Form and OFA', Account: 'Home Mail Server', Server: 'mail.tpg.com.au', Protocol: SMTP, Server Response: '530 Authentication required', Port: 25, Secure(SSL): No, Server Error: 530, Error Number: 0x800CCC78