2 ms·Doesn't just about every mail service proxy, and often preemptively fetch those?by TylerE 3y agoDoesn't just about every mail service proxy, and often preemptively fetch those?jeroenhd 3y agoNot every service, buy many of them do.TylerE 3y agoI'm quite sure GMail does... which is basically the entire internet as far as mail delivery.