POP to IMAP Importer

A Rust application that downloads emails from a POP3 server and imports them into an IMAP server's INBOX.

Features

POP3 to IMAP Migration: Downloads all emails from a POP3 server and imports them to IMAP
IMAP Email Normalization: Fix existing malformed emails already in your IMAP inbox
Secure TLS connections
Environment-based configuration
Automatic email header normalization (RFC 5322 compliance)
- Fixes improperly formatted header continuation lines
- Ensures continuation lines start with proper whitespace
Safe operation with dry-run mode and confirmation prompts

Setup

Copy .env.example to .env:
```
cp .env.example .env
```

Edit .env with your server credentials:

# POP3 Source Server Configuration
POP3_HOST=pop.example.com
POP3_PORT=995
POP3_USERNAME=your_pop3_username
POP3_PASSWORD=your_pop3_password

# IMAP Destination Server Configuration
IMAP_HOST=imap.example.com
IMAP_PORT=993
IMAP_USERNAME=your_imap_username
IMAP_PASSWORD=your_imap_password

Usage

POP3 to IMAP Migration

Run the main importer to migrate emails from POP3 to IMAP:

cargo run --bin pop-to-imap
# or in release mode
cargo run --release --bin pop-to-imap

Normalize Existing IMAP Emails

If you already have malformed emails in your IMAP inbox, use the normalization tool:

# Dry run to see what would be changed
cargo run --release --bin normalize-imap -- --dry-run

# Actually normalize the emails (will prompt for confirmation)
cargo run --release --bin normalize-imap

# Skip confirmation prompt
cargo run --release --bin normalize-imap --yes

Note: The normalize-imap tool will:

Fetch all emails from your IMAP INBOX
Analyze which emails have malformed headers
Show you a summary of what needs to be fixed
Delete and re-import only the emails that need normalization
Keep emails that are already RFC 5322 compliant unchanged

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