I understand that Mullvad has deprecated Gmail months ago, yet you claimed otherwise. I am assuming good-faith, but since you regularly criticise Mullvad, Clarification on the Swedish Covert Surveillance Act with high persistance (for what benefits?).
I don’t want to accuse you of anything, and haven’t said you lied. What you said about MX records might be true, but it doesn’t change the fact that Mullvad doesn’t use Gmail anymore.