This is slightly different to e-mail sponsorship as it is usually based around impressions rather than a long-term sponsorship fee. It essentially involves the advertiser placing a banner to their website within your email.

You can advertise this kind of opportunity on the likes of LaunchBit (Integrates with MailChimp), BuySellAds and Newsletter Directory.

Advantages: As far as setting this up goes, it's pretty straight-forward. If your e-mail newsletter goes out to a large amount of people then you can make a good earner on impression-based payment. If you get a lot of engagement from your mailing list then you can take it a step further and offer pay per click at a premium cost.

Disadvantages: Having a newsletter full of banner ads doesn't always look great and can end up either putting readers off or reducing the amount of clicks coming through to your website. Alongside this, email advertising has become less popular of late, so it isn't always easy to get advertising partners.