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RainLoop is a simple, modern & fast web-based email client. Further details at https://www.rainloop.net.

Features include:

• Modern user interface.
• Complete support of IMAP and SMTP protocols including SSL and STARTTLS.
• Sieve scripts (Filters and vacation message).
• Minimalistic resources requirements.
• Direct access to mail server is used (mails are not stored locally on web server).
• Allows for adding multiple accouns to primary one, simultaneous access to different accounts in different browser tabs is supported. Additional identities.
• Administrative panel for configuring main options.
• Really simple installation and update.
• Integration with Facebook, Google, Twitter and Dropbox.
• Managing folders list.
• Simple look'n'feel customization.
• Configurable multi-level caching system.
• Extending functionality with plugins installed through admin panel.
• Perfect rendering of complex HTML mails.
• Drag'n'drop for mails and attachments.
• Keyboard shortcuts support.
• Autocompletion of e-mail addresses.

Install as follows:

helm repo add funkypenguin https://funkypenguin.github.io/helm-charts
helm repo update
helm install --name rainloop rainloop