Gomailify has rolled out their new system using a Google API to link to your Gmail account, meaning even better performance and no use of POP3 fetching or forwarding. You need to sign in using OAUTH. You still get SMTP for sending, a new dashboard, unlimited aliases and domains, and fast customer service for $12 per year. They grandfathered in existing customers and are adding a free month to existing subscriptions. Very slick.
https://www.gomailify.com/