Asking properly.
THE PRINCIPLE
An enquiry is not permission to market to someone.
HOW TO ASK
A separate, unticked checkbox.
"I would like to receive occasional updates by email."
WHAT NOT TO DO
Pre-ticked boxes Bundling consent into the main submission Wording that makes declining difficult
WHY IT MATTERS
Beyond the legal position, people who did not agree mark you as spam.
That damages your sending reputation and affects all your email.
WHAT TO RECORD
That consent was given, when, and what they agreed to.
Your form plugin should store this with the submission.
FOR EXISTING CONTACTS
If you have a list gathered without clear consent, consider a re-permission message.
Losing some subscribers is better than a damaged sending reputation.
WHAT TO MAKE EASY
Unsubscribing. Every marketing message must offer it.
WHERE TO STATE YOUR POSITION
Your privacy notice, linked from the form.