Cranemail email hosting now comes with rclone and iOS push feature
Cranemail implemented Z-Push which is an open source ActiveSync implementation that allows you to get push notifications for emails on your iOS/Android mail clients as well as faster contact/calendar syncing. Also a customized Rclone to allow support is added for the CraneMail backend. You get it from their Github rclone releases repo. Also one-click account login is added, bulk users/alias and email forwarders are added. They also offer SMTP, POP3, IMAP, MAPI + EWS as supported email protocol.