i2pplus

SusiMail (susimail/)

Webmail interface for I2P. Provides POP3/SMTP access to email through I2P, with local caching for privacy and offline access.

Overview

SusiMail bridges traditional email to I2P:

Internet Email --> [SMTP into I2P] --> I2P Router --> [POP3 out] --> Local client

Privacy Features

• Local caching - Messages stored locally, not fetched on-demand
• Header scrubbing - Removes Internet email headers identifying your router
• No external MX - All traffic stays within I2P
• Outbound encryption - All emails encrypted to I2P destinations

Email Flow

1. Inbound (POP3) - External POP3 server fetches → local cache → I2P-deliverable
2. Outbound (SMTP) - Composes in web UI → encrypts to recipient destination → sends over I2P

Configuration

Requires an external POP3/SMTP server for Internet email. Configure in console:

• POP3 server, username, password
• SMTP server for outbound
• Reply-to address mapping

Use Cases

• Hidden email - Use .i2p destinations as email addresses
• Anonymous leaks - Send to secure drop points
• Mail2web - Internet email to .i2p destinations

Packages

• i2p.susi.webmail - Mail cache, message handling, web UI
• i2p.susi.webmail.pop3 - POP3 client
• i2p.susi.webmail.smtp - SMTP client

Building

# Gradle
./gradlew :apps:susimail:jar

# Ant (from repo root)
ant buildSusiMail