Hi Diane... There must be something more : I made a test from my online mail provider (@free.fr) versus my company mail server (@cyclo-pump.com) with this online tool :

http://www.mail-tester.com

Free.fr get a 5/10 legally note for being a spammer mail box (and that's true because this email address is blacklisted three times)

otherwise Cyclo-pump.com, my company mailer, is totally clean : get a 7/10 note and has never been blacklisted anywhere.

Guess what !? Free.fr can send mail easily to my outlook.com mailbox otherwise Cyclo-pump.com is dropped in the Spam folder...!!!

According to http://www.mail-tester.com , the two domains Free.fr and Cyclo-pump.com have the same features of mailer guaranty (Authentication, encryption, etc...)

Who can tell me what I must do for Cyclo-pump.com mails to be received as Not Spam by outlook.com , please ??