Hi bigchap,
Thank you for reaching out to us here on the Community.
I am sorry to hear you are not able to receive emails from a particular sender.
Has the sender checked and confirmed that the issue is not from their end and that they are able to send emails to others? If so, can you please check your email settings to ensure you have not made any amendments that could be preventing your from receiving the emails?
Please let us know how you get on.
Thanks
Nat