K9 Alternatives

Newton is a fully featured mail client available for Android, iOS, macOS and Windows.

Android Mail Client.

VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.

Try for free paid Free Trial $4.99 / Monthly (User)

Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.

myMail is the smart email app for managing all your accounts on iOS and Android.

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.

Open source, privacy friendly email app

Open Source

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues

Open Source

POPFile classifies email into categories you define.

Over 8 million people use MailWasher as their spam filter

SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird

Save time by adding powerful spam filtering to the e-mail client on your Mac.

Secure email with absolutely no compromises. Get your free encrypted email account today.

freemium €5.0 / Monthly (user - 5 GB)