finfollow/config/packages/imap.yaml

imap:
    connections:
        finfollow:
            imap_path: "%env(IMAP_PATH)%"
            username: "%env(IMAP_USERNAME)%"
            password: "%env(IMAP_PASSWORD)%"
            attachments_dir: "%env(IMAP_STORE_ATTACHMENTS_DIR)%"
#            server_encoding: "UTF-8"