With Mailster you can use over 900.000 photos for free from directly in the editor. All photos are released under the Unsplash License.
Add photos to your campaign
Create a new campaign or edit an existing one and add a module with an image to your email.
When you click on the image Mailster will reveal the editbar with the picpicker.

Click on the “Unsplash” radio button to search the whole database from over 130.000 photographer. You can embed images from Unsplash like photos from your media library.

While it’s not required to credit the photographer it’s recommend to keep the name in the alt text field.