Email set up

Newbie here,

New computer (Windows 10), backups complete etc, but I cannot for the life of me get my email set up to send invoices, purchase orders etc.

I use Outlook , I have it logged into windows live mail but was told I needed to go to the control panel -> user accounts -> Mail 32 bit and set it up through IMAP. After great difficulty I had it successfully connect; however, emailing from sage still does not work. Instead I get a lovely error message that states " An error occurred in resolving name. Return Code: 3 MAPI_E_LOGON_FAILURE"

What in the world do I have wrong? I have been trying to fix this for a week now and seriously haven't a clue what I did wrong or better yet, what I haven't done. Any help would be greatly appreciated