White backgrounds are suddenly a cream color - not bright white

For the past 3 months, I've noticed that when I choose White for a background in my emails, it's now a very light beige, or cream. It's no longer a crisp white. Chatted with a CC rep, showed him screenshots. He agreed that the background looked cream-colored, even though on his end it looks crisp white. Checked with a couple of friends who receive my CC emails, and they said the background was a cream-color as well. Not sure what happened - I've used CC for years, never had this issue before.