A good subscription form answers the reader's immediate questions: what will arrive, who will send it and how often it is likely to appear. It should not rely on a preselected box or vague language that hides a marketing subscription inside another action.
An email address is often enough. Ask for a name, company or preference only when that information has a clear use in the campaign. Fewer fields also leave less personal data to store and protect.
Place the description beside the form rather than hiding it in a long policy. If the schedule changes or several types of email are included, let readers choose the messages they want where practical.
A confirmation message can verify ownership of the address and reduce mistakes. Keep it brief, identify the sender and make the confirmation link easy to recognize.
Deliver what the form promised, remind the subscriber why the message arrived and explain what comes next. Include normal sender identification and an unsubscribe link from the beginning.