A trustworthy newsletter begins with a clear invitation. People should understand what they are signing up for, how often they might hear from you and how to stop receiving messages.
Ask directly
Use a dedicated form that names the newsletter and describes its subject. Do not treat a contact inquiry, purchase or business relationship as automatic permission to send marketing email.
Set expectations
Tell subscribers what kind of content to expect and provide a privacy notice near the form. Do not preselect consent or hide the subscription behind unrelated actions.
Honor the choice
Make unsubscribe easy to find and act on promptly. Maintain a suppression record so an unsubscribed address is not accidentally added back to future sends.
Protect the list
Use the subscription data only for the stated purpose, restrict access, and remove or suppress addresses when they bounce, complain or unsubscribe.