Emails blocked by serve for my Outlook computer software

I am receiving messages when trying to send/receive emails for my two comcast.net email accounts using MS Outlook 365 on my desktop computer. Emails from other server companies are coming through fine. What do I do to get Comcast to stop blocking my emails to my Outlook. YES, the emails are working fine on comcast.net email page but I don't use it, I use Outlook. Here is the error messages I get when I try to sync the accounts in Outlook:

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Task 'Synchronizing subscribed folders for [Edited: "Personal Information"].' reported error (0x800CCC0E) : 'Outlook cannot synchronize subscribed folders for [Edited: "Personal Information"]. Error: Cannot connect to the server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'

Task 'Synchronizing subscribed folders for [Edited: "Personal Information"].' reported error (0x800CCC0E) : 'Outlook cannot synchronize subscribed folders for [Edited: "Personal Information"]. Error: Cannot connect to the server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'
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