Using BT internet to relay emails

[Asturias56]

Fixed with the help of a suggestion after I posted on the Microsoft Users Community

You go into Outlook - select File then Account Settings

Use Manage Profiles which gives you Mail Setup dialog - choose email accounts

Select the profile you want to send company mail from and select change above

Fill in the details - Incoming is your company server ,Logon is your company password
Outgoing is your BT server (mail.btinternet.com) ,

Select More Settings then Outgoing settings

Select my outgoing server requires authentication

Fill in login using your BT account details

Select advanced - incoming port 110 no encryption
Outgoing port 587 no encryption

It then logs in and sends a test email