SpamAssassin - Use this program to "Unspam" your mailbox(es).
Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
myMail - myMail is the smart email app for managing all your accounts on iOS and Android.
Oikik Antispam - Oikik is a cloud-based email filtering service that works with your existing email service.
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.