M365 Mail

Microsoft 365 Mail

CLI tool for Microsoft 365 email via Microsoft Graph API.

Setup (One-time)

1. Register Entra ID App

1. Go to Entra ID Portal → App registrations → New registration
2. Name: m365mail-cli (or whatever)
3. Supported account types: "Accounts in this organizational directory only"
4. Redirect URI: Leave blank (using device code flow)
5. Click Register

2. Configure API Permissions

1. In your app → API permissions → Add a permission
2. Microsoft Graph → Delegated permissions
3. Add: Mail.ReadWrite, Mail.Send
4. Click "Grant admin consent" (or have admin do it)

3. Enable Public Client Flow

1. In your app → Authentication
2. Under "Advanced settings", set "Allow public client flows" to Yes
3. Save

4. Note Your IDs

• Application (client) ID: Found on app Overview page
• Directory (tenant) ID: Found on app Overview page

5. Install & Configure

# Install dependencies
pip install msal requests

# Make executable
chmod +x skills/m365-mail/scripts/m365mail.py

# Optional: symlink to PATH
ln -s $(pwd)/skills/m365-mail/scripts/m365mail.py /usr/local/bin/m365mail

# Configure
m365mail setup --client-id <YOUR_CLIENT_ID> --tenant-id <YOUR_TENANT_ID>

# Authenticate (opens browser for device code)
m365mail auth

Commands

List Inbox

m365mail inbox                    # Last 20 messages
m365mail inbox -n 50              # Last 50 messages
m365mail inbox -u                 # Unread only
m365mail inbox -v                 # With preview
m365mail inbox --json             # JSON output

Read Message

m365mail read <message_id>        # Full message
m365mail read <id> --max-length 500  # Truncate body
m365mail read <id> --json         # JSON output

Search

m365mail search "quarterly report"      # Full-text search
m365mail search -f boss@company.com     # From specific sender
m365mail search -u                      # Unread only
m365mail search -a                      # Has attachments
m365mail search "budget" -f cfo@co.com -u  # Combine filters

Send Email

m365mail send --to user@example.com --subject "Hello" --body "Message body"
m365mail send --to a@x.com b@x.com --cc c@x.com --subject "Hi" --body "Text"
m365mail send --to user@x.com --subject "Report" --body-file report.txt
m365mail send --to user@x.com --subject "HTML" --body "<h1>Hi</h1>" --html

Manage Messages

m365mail folders                  # List all folders
m365mail move <message_id> Archive    # Move to folder
m365mail move <message_id> "Deleted Items"
m365mail delete <message_id>      # Permanently delete
m365mail mark <message_id> --read     # Mark read
m365mail mark <message_id> --unread   # Mark unread

Output Formats

• Default: Human-readable table/text
• --json: Machine-readable JSON (use for programmatic access)
• -v/--verbose: Include message preview

Message IDs

Messages are identified by long IDs like AAMkAGI2.... Commands accept:

• Full ID
• ID prefix (first 8+ chars usually unique)

The inbox/search output shows [AAMkAGI2] prefixes for easy reference.

Token Storage

Tokens cached at ~/.m365mail/:

• config.json - Client/tenant IDs
• token_cache.json - OAuth tokens (auto-refreshes)

Troubleshooting

"No cached token": Run m365mail auth

Permission denied: Ensure Mail.ReadWrite and Mail.Send permissions are granted (may need admin consent)

Token expired: Tool auto-refreshes; if issues persist, run m365mail auth again