I use my email domain on login.microsoftonline.com. It then prompts me to chose if my account is personal or part of my organization's. I select the latter, which then redirects me to my organization's portal page, https://grails.cccs.edu/Office365/. After entering my credentials (note: the username is not my email address), the page https://outlook.office365.com opens. In the Office365 mail settings, I'm given the server settings pictured below. When I run NSLookup, however, the incoming server is listed as 1092176239.mail.exchangelabs.com a clear departure from what Microsoft claims. These being the facts, when I attempt to establish a mail management connection in Thunderbird, I'm not successfully connected to the my organization's SSO (like I might be with a Gmail account to enter credentials) nor does Thunderbird recognize the accurate password authorization that I provide, in part it may be because my login username is not my email address and the incoming and outgoing server are different than the autoconfiguration Thunderbird assumes I'll be using based on my domain. Please help me understand how to get the handshake happening correctly, as I'm at a loss and frustrated.