Well under the CAN-SPAM act alone the last marketing email I got alone is trouble.

I quote canspam -

Tell recipients how to opt out of receiving future email from you. Your message must include a clear and conspicuous explanation of how the recipient can opt out of getting email from you in the future. Craft the notice in a way that’s easy for an ordinary person to recognize, read, and understand. Creative use of type size, color, and location can improve clarity. Give a return email address or another easy Internet-based way to allow people to communicate their choice to you. You may create a menu to allow a recipient to opt out of certain types of messages, but you must include the option to stop all commercial messages from you. Make sure your spam filter doesn’t block these opt-out requests. Honor opt-out requests promptly. Any opt-out mechanism you offer must be able to process opt-out requests for at least 30 days after you send your message. You must honor a recipient’s opt-out request within 10 business days. You can’t charge a fee, require the recipient to give you any personally identifying information beyond an email address, or make the recipient take any step other than sending a reply email or visiting a single page on an Internet website as a condition for honoring an opt-out request. Once people have told you they don’t want to receive more messages from you, you can’t sell or transfer their email addresses, even in the form of a mailing list. The only exception is that you may transfer the addresses to a company you’ve hired to help you comply with the CAN-SPAM Act.

I now quote in full the email I received.

"Hello.

We have implemented the ability for you to sell your gallery images on Renderosity!

The first step is to look here:

https://www.renderosity.com/mod/gallery/?sales

where you can see any images you have that are currently on the site and in your gallery that are eligible to be sold. Simply review the license information here:

https://www.renderosity.com/gallery-image-licenses-cms-19465

so that you are clear on what you are agreeing to when sales are done BEFORE selecting or submitting images to be sold.

You can also upload NEW images and sell those as well. Please read the upload gallery image page closely for details and instructions.

If you have any questions, send an email to store@renderosity.com for assistance. We are very excited to bring this opportunity to our Artists! We hope you take advantage of this money making oppportunity that is now available for you!!

Have a great weekend!

Jenn & our entire Marketplace Team"

Note the missing opt out message.