Q: Problems receiving email from United Airlines

I can not receive email from United Airlines! I tested this to isolate the problem in multiple ways- I requested the United flight itinerary be sent (via a web request) to my address at xxx@mac.com  and xxx@me.com   and to my @icloud address.  None of them worked. Then I had the same itierary sent to a work email address on the same computer and same network and received it no problem.  I checked all my junk mail filtering- nothing from United was apparently flagged either on the web-version of macmail or my laptop macmail.  Then, I requested United send the iterinary to my husband's @mac.com account- also would not go through!  Again, tried same request to my work address- same host (ATT), same hardware, same network, same 5 minutes, same request from United.  -- got the itinerary no problem. I could FORWARD the work email containing the United itierary to my  @mac address-- got it- same 5 minutes etc.  So this  has got to be a filtering problem from Apple that they have not told us about!  I cannot believe no one else has noticed thisn (see a Yahoo problem that others have reported)!  I cant figure out how to let Apple know there is a problem!