Facebook and instagram emails not received

I have an ntl email address. Problem is that all emails from Facebook and instagram are not getting through. Eg notification emails/ password reset emails etc. Same also with some other legitimate emails from other sites not getting through. They are not in my spam folder. It seems thst that virgin  is blocking them before they have even reached my email account. I have a second ntl world email address that does allow these emails through, but problem is thst facebook etc still use my original email account to send some messages even though I have changed the setting there and  also wondering what other important emails I might not be getting. Can somebody at virgin media help please. Thanks