Outlook not downloading one particular email

I have one particular email that does not download from the server.

I see it on the server but it does not download to my desktop outlook.

 

I have also tried other email addresses in case it was server related.

 

I have added it to my Outlook Allow list and it does not show on a blocked list etc....

GoToWebinar.Notifications@citrixonline.com

 

This is a very prominate email notice from Go To Webinar.   I would guess thousands are sent out daily.

 

No one else is reporting issues.   Any ideas?