Mail-in-a-box
Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
19 Alternatives To Mail-in-a-box
Airmail
Airmail is a lightweight and lightning fast mail client for Mac.
Apple Mail
There’s big news attached.
Front App
multi-channel inbox service for collaborative teams
Gaggle Mail
Gaggle Mail is a simple and easy to use email list manager.
MDaemon Messaging Server
Low cost, easy to use Email Server software for virtual, on-premise, or hosted deployments for…
Mailbird
Mailbird is the best email client for Windows 7, 8 and 10
Mailpile
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
Mailspring
Mailspring is a mail client for Mac, Windows and Linux.
NeutronMail
Self-hosted server for the ProtonMail client.
Outlook
Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Postbox
The Power Email App for busy professionals, like you.
ProtonMail
Secure email with absolutely no compromises. Get your free encrypted email account today.
Roundcube
Web-based IMAP email client
Sanebox
SaneBox is a cloud-based service that allows users to filter and manage their emails.
Zimbra Collaboration Suite
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
Zoho Mail
Zoho Mail is a webmail service built with the needs of a modern business in mind.
eM Client
eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.
iRedMail
A fully fledged, free email server solution, an open source project (GPL v2).
mailcow dockerized
An open source mailserver suite.