10042 'SMTP 550 - Requested action not taken: mailbox unavailable' may indicate your account is protected and needs to be authorized. For Hotmail.com, Outlook.com, etc. accounts sign in with a browser to check for alerts.
This Solution provides troubleshooting information (6504)
Big Business Mail lets you send email using multiple accounts including Hotmail.
This Solution provides setup information (6505)
If you rely on Sent Mail to remind you what information you've given customers, you'll love Big Business Mail, which lets you:
- share the information you've sent to customers with other Big Business Users
- share the information other Big Business Users have sent to customers
Big Business Mail respects that people like email from people and lets each user send from their own email, be it corporate email or a service like Hotmail, Gmail, or Outlook.com.
This Solution provides an overview. (6506)
Built-In Email is being tested.
This Solution describes possible options. (6459)