migrate-imap-account-to-gmail

Python script that migrates mail from an IMAP server account to a Gmail account. Preserves source account folder structure and saves mail under the root folder. Folders can be skipped by listing them in SOURCE['IGNORE_FOLDERS']. Tracks migration in database so that migration will continue from the last seen message in case of interruption or when new mail needs to be synchronized from the source account.

Tested with Exchange to Gmail and Gmail account and succesfully transferred 100k+ emails. Should also work with a non-Gmail target account.

Usage

1. Install dependencies:

    pip install six https://bitbucket.org/mrts/imapclient/get/default.zip
   

2. Create configuration:

    cat <<EOF > conf.py
    SOURCE = {
        'HOST': 'example.com',
        'USERNAME': 'user',
        'PASSWORD': 'password',
        'SSL': True,
        'IGNORE_FOLDERS': ('[Gmail]',
                           '[Gmail]/Trash', '[Gmail]/Spam',
                           '[Gmail]/Starred', '[Gmail]/Important')
    }
   
    TARGET = {
        'HOST': 'imap.gmail.com',
        'USERNAME': 'user@gmail.com',
        'PASSWORD': 'password',
        'SSL': True
    }
    EOF
   

3. Run the script:

    ./migrate-imap-account-to-gmail.py
   

It may take a while, here's sample output from a live run:

Synchronization of 12571 messages finished, took 6:44:35.101650