The King of Webmail.

Packed with Features

Enjoy live email notifications, an all-mighty email composer, read tracking, quick attachment previewing, attachment saving and sharing, email reminders and many, many more.

Easy to Use

CrossBox is recognized for its exceptional in-app user experience. You'll notice how immediately it feels comfortable and easy to navigate. It just feels right.

GDPR Compliant

Constructed to be fully compliant with strict EU privacy regulations. It's a genuine self-hosted solution, with you in absolute control of your data. Your data, your rights.

Everything You'll Ever Need

With the

intelligent features that help you achieve more

Mighty Email Composer

Effortlessly write professional and content-rich emails with CrossBox's simple to use and agile email composer. You can format your email's text in detail, insert images, drag-n-drop files and even edit the HTML source itself.

Email Attachment Preview

Not knowing what's in that .docx or .xlxs file without actually downloading it is now a thing of the past. Documents, audio, and even video files are fully previewable within CrossBox.

Attachment Saving & Sharing

Quickly sharing an email attachment wasn't possible till CrossBox moved in. You can now promptly and securely share an email attachment with a co-worker, your team or anyone in the world.

Beautiful Email Signatures

Choose from over 50 ready to use, professional looking email signatures that help you leave a permanent impression. You can also create a custom signature with images and links by using our robust HTML editor.

Real Time Browser Notifications

Chrome, FireFox and Edge

😍 Emojis in Mail

Native Support

HTML Editor

Message Source Control

Anti Tracking

Built in


Often feel not ready to respond to an email right away, but then you forget about it all together? Not to worry, this happens to all of us. Just create an email reminder, and it'll notify you in time.

Delayed Sending

Set a timer to keep an outgoing email message in a temporary queue. In case you change your mind, you can stop an email from being sent with a simple click.

Read Notifications

CrossBox's powerful email tracking provides you a much-needed report about the read status of the emails you send. You'll receive an instant push notification as soon as someone sees your email.

Spam Indicator

Native Support

Spam Learning

Teach an AI to classify spam

Anti Identity Spoofing

Know when someone is faking identity

Custom Email Folders

Organise your email space by separating emails into different mailboxes. For better visual distinguishability, you can give each mailbox its appropriate icon and color.

Conditions and Actions

Lets you create a set of circumstances to match and moves to execute when a new email arrives. For instance, you might want to transfer an email to a different mailbox and mark it as read if the conditions you defined are satisfied.

Advanced Search

Never again waste time in an endless search for that email you for sure know is there. CrossBox can locate and highlight precisely what you're looking for, in under 200ms. It even hunts down on a deeply buried email attachment you received years ago.

Email Import

Effortlessly import email messages from any IMAP server. Just fill in the email address and password, and CrossBox will do the rest. You can track the progress in real time and nevertheless continue using the App while importing is done in the background.

Integrates Everywhere

With no external dependencies and thanks to its plug and play architecture, CrossBox is runnable anywhere. You can install it on your cPanel or Plesk server, containerize it with Docker or run it on any VPS or a bare-metal server.