Email Send/Receive Error Message

Up until today, my email was working flawlessly.

However, today I am unable to receive new emails and get the following error messages:

Task '[redacted for privacy]@comcast.net - Receiving' reported error (0x800CCC1A) : 'Your server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mail server administrator or Internet service provider (ISP) for additional assistance.'

On a second email address:

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

Please note that I have made no changes, so I'm not sure what the problem is.

Thanks.