FM-Cli

A minimalist, terminal-based user interface (TUI) for Fastmail, built in Go.

Features

Email

• Mailbox Navigation: Browse your folders with unread counts
• Email Reading: Plain text and HTML-to-Markdown rendering with clickable links
• Composition: Write emails using your preferred $EDITOR (Vim, Nano, etc.)
• Contact Autocomplete: Type in the To field and get suggestions from your address book
• Multiple Identities: Select from your configured Fastmail sending addresses
• Reply & Forward: Reply to sender, reply all, or forward with quoted content
• Draft Management: Save, edit, and send drafts
• Email Actions: Mark read/unread, flag, archive, and delete
• Inline Images: View images in terminal (Sixel/Kitty/iTerm2) or open in browser
• Pagination: Infinite scroll through large mailboxes

Calendar

• Agenda View: See upcoming events for the next 7 days
• Event Management: Create, edit, and delete events
• CalDAV Integration: Syncs with Fastmail calendars

Contacts

• Address Book: Browse and search your contacts
• Contact Management: Create, edit, and delete contacts
• CardDAV Integration: Syncs with Fastmail address books

Offline Mode

• Local Storage: Emails cached in SQLite for offline reading
• Full Body Caching: Email bodies pre-fetched for complete offline access
• Offline Drafts: Compose emails offline, sync when back online
• Pending Actions: Changes queued and synced automatically

Other Features

• Secure Auth: Credentials stored in system keyring
• OSC 8 Links: Clickable hyperlinks in supported terminals
• Detailed Headers: Toggle expanded email headers
• Auto-Refresh: Automatic sync after actions

Installation

From Package Manager

Arch Linux (AUR)

yay -S fm-cli
# or
paru -S fm-cli

Debian/Ubuntu

# Download the .deb package from releases
sudo dpkg -i fm-cli_0.2.0_amd64.deb

Fedora/RHEL

# Download the .rpm package from releases
sudo rpm -i fm-cli-0.2.0-1.x86_64.rpm

From Source

Prerequisites

• Go 1.21+
• CGO enabled (for SQLite support)
• A Fastmail account

Build

git clone https://github.com/timappledotcom/fm-cli.git
cd fm-cli
go build -o fm-cli ./cmd/fm-cli
sudo mv fm-cli /usr/local/bin/

Configuration

Quick Start

1. Get your Fastmail credentials (see below)
2. Run the login wizard:

   fm-cli login

3. Start the app:

   fm-cli

Getting Your Fastmail Credentials

API Token (Required - for email)

1. Log in to Fastmail
2. Go to Settings → Privacy & Security → Integrations → API Tokens
3. Click New API Token
4. Give it a name (e.g., "fm-cli")
5. Select permissions: Mail (read/write) and Submission
6. Copy the generated token

App Password (Optional - for calendar/contacts)

1. Go to Settings → Privacy & Security → Integrations → App Passwords
2. Click New App Password
3. Select Mail, Contacts & Calendars access
4. Give it a name (e.g., "fm-cli-dav")
5. Copy the generated password

Note: The App Password uses CalDAV/CardDAV protocols which require separate authentication from the JMAP API token.

Environment Variables (Alternative)

Instead of using the login command, you can set environment variables:

export FM_API_TOKEN="your-api-token"
export FM_EMAIL="you@fastmail.com"
export FM_APP_PASSWORD="your-app-password"  # Optional

Data Storage

• Credentials: Stored securely in your system keyring
• Offline data: ~/.config/fm-cli/emails.db (SQLite)

Usage

Commands

Command	Description
fm-cli	Start the TUI
fm-cli login	Store credentials in system keychain
fm-cli logout	Remove credentials from keychain
fm-cli settings	View current settings
fm-cli settings offline on	Enable offline mode
fm-cli settings offline off	Disable offline mode
fm-cli sync	Sync pending offline changes
fm-cli debug	Show debug info (JMAP session, CalDAV/CardDAV status)
fm-cli help	Show help

Offline Mode

Enable offline mode to cache emails locally:

fm-cli settings offline on

When enabled:

• Emails and mailboxes are cached in SQLite
• Email bodies are pre-fetched for complete offline reading
• Read cached emails without internet
• Compose drafts offline (queued for sync)
• Run fm-cli sync to push pending changes

Inline Images

When viewing an email with images:

• Press b to open the email in your browser
• Press i to render images inline (requires Sixel/Kitty/iTerm2 terminal support)

Supported terminals for inline images:

• Kitty
• iTerm2
• WezTerm
• Foot
• mlterm
• Any terminal with Sixel support

Controls

Global Navigation

Key	Action
0	Return to main menu
1	Go to Mail
2	Go to Calendar
3	Go to Contacts
4	Go to Settings
q	Quit (from main menu)

Main Menu

Key	Action
j / k (or Arrows)	Navigate up/down
Enter / l	Select item
m	Go to Mail
c	Go to Calendar
o	Go to Contacts
s	Go to Settings

Mailbox List

Key	Action
j / k (or Arrows)	Navigate up/down
Enter / l	Open mailbox
h / Esc	Back to main menu
r	Refresh
c	Compose new email

Email List

Key	Action
j / k (or Arrows)	Navigate up/down
Enter / l	Open email
h / Esc	Go back to mailboxes
u	Toggle read/unread
f	Toggle flagged
e	Archive
d / Backspace	Delete
r	Refresh
c	Compose new email

Email View

Key	Action
h / Esc	Go back to email list
R	Reply to sender
A	Reply all
F	Forward
m	Toggle detailed headers
b	Open in browser
i	View inline images (if terminal supports)
e	Edit (drafts only)

Compose

Key	Action
↑ / ↓	Navigate contact suggestions
Tab	Select suggestion / Cycle identities
Enter	Select suggestion / Continue to next field
Esc	Dismiss suggestions / Cancel

Send Confirmation

Key	Action
y	Send email
s	Save as draft
e	Edit body
n	Cancel
Tab	Change sending identity

Calendar (Agenda View)

Key	Action
j / k (or Arrows)	Navigate events
Enter / l	View event details
n	Create new event
e	Edit event (from details view)
d	Delete event
r	Refresh
h / Esc	Back (from details) or to menu

Calendar Event Editor

Key	Action
Enter	Save event
Esc	Cancel

Contacts

Key	Action
j / k (or Arrows)	Navigate contacts
Enter / l	View contact details
n	Create new contact
e	Edit contact (from details view)
d	Delete contact
r	Refresh
h / Esc	Back (from details) or to menu

Contact Editor

Key	Action
Tab	Move to next field
Enter	Save contact
Esc	Cancel

Settings

Key	Action
j / k (or Arrows)	Navigate
Enter	Toggle setting
h / Esc / 0	Back to main menu

Troubleshooting

"No calendars found" or "No address books found"

• Make sure you've configured an App Password (not just the API Token)
• Run fm-cli debug to check CalDAV/CardDAV connection status
• The App Password must have "Mail, Contacts & Calendars" permission

"Calendar/Contacts not available in offline mode"

• Calendar and Contacts require an internet connection
• Only email supports offline mode currently

Crashes when switching modes

• If you started in offline mode but want to go online, restart the app
• The JMAP client is only initialized at startup

Images not displaying inline

• Your terminal must support Sixel, Kitty graphics, or iTerm2 inline images
• Use b to open in browser as a fallback

Building Packages

Debian/Ubuntu (.deb)

./scripts/build-deb.sh

Fedora/RHEL (.rpm)

./scripts/build-rpm.sh

Arch Linux (PKGBUILD)

cd packaging/archlinux
makepkg -si

License

MIT License - see LICENSE for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.