If anyone is using RAC.ca to forward their callsigns to a Hotmail address, be warned, because Microsoft has blacklisted that domain.
Don (VA7IQ) has been investigating and discovered that the problem is caused by the spam filters for anyone using Microsoft accounts such as Hotmail, Outlook and Live.
Microsoft maintain list of domains that are accepted or rejected and drops any email received from a blacklisted domain. This is not an easy solution for RAC, but if you change to a non-Microsoft account in the short-term, such as Yahoo or Gmail, then the problem will be alleviated.