AI Email Marketing: Newsletters People Read, GDPR-Compliant (and What Medieval Couriers Knew)

AI writes a newsletter subject line in three seconds, offers five versions of the copy and suggests who to send it to. That's a huge help for a small business running email marketing with one person. But email is also the channel with the strictest rules: consent, opt-out, provider technical requirements. This guide covers both: what to hand to AI and what you can't hand to anyone.

Letters people waited for: the merchants' couriers

In the 13th and 14th centuries Italian merchants had companies, branches and correspondents spread across Flanders, France, Catalonia and the Levant. Everything ran on letters: orders, news, payment confirmations. To move them, as Juraj Kittler's study of courier networks in Italy from 1260 to 1600 shows, an ad hoc system of messengers grew into organized, professional networks, first on foot and then on horseback, eventually with rival courier businesses. Florentine merchants agreed on a shared courier service, the scarsella, with regular departures to the main trading centers.

What was in those letters? Besides company business, often the prices of goods and exchange rates in the correspondent's market. Useful, fresh, expected information. The recipient opened the letter because he knew the sender and knew there was something he needed inside.

Your newsletter should be one of those letters: a known sender, a regular rhythm, useful content. AI helps you write it faster and send it to the right person. It can't make it welcome to someone who never asked for it.

What AI does well in email marketing

Major platforms now include assistants: Brevo has Aura for subject lines and content; Mailchimp offers AI writing help through Intuit Assist. Availability varies by plan: check the official sites.

Three prompts to adapt

Subject line: "Suggest 8 subject lines of up to 45 characters for this newsletter [paste text]. Audience: [description]. No all caps, no multiple exclamation marks, no promises not in the text."

Newsletter from notes: "Turn these notes into a 250-word newsletter, direct tone, second person. One call to action: [action]. Use only the information provided."

Analysis: "Here are the results of the last 12 campaigns [table without personal data]. Identify which topics and days got the most clicks and suggest 3 hypotheses to test."

Note the last bracket: without personal data. Before pasting contact lists into an external AI tool, ask whether it's necessary. It almost never is.

The rules: consent, soft opt-in, opt-out

In Italy, the Data Protection Authority's guidelines on marketing and spam, based on article 130 of the Privacy Code (which implements the EU ePrivacy Directive), set out the key points:

• Prior consent. Promotional email generally requires the recipient's prior consent: free, informed, specific and documented. Pre-ticked boxes or consent required to use a service don't count.
• "Public" addresses aren't fair game. An address found on a website or public directory doesn't authorize promotions without consent.
• Soft opt-in. If you obtained a customer's email in the context of a sale, you may send them messages about similar products or services without consent, as long as they were properly informed and haven't objected. Email only, your own similar products only.
• Easy opt-out in every message.
• Third-party lists. Sharing data with third parties for their marketing requires specific, separate consent.

Practical advice, not a legal requirement: double opt-in helps you document consent and keep bad addresses out.

Provider requirements: Gmail and others

Google's sender guidelines require all senders to authenticate their domain with SPF or DKIM, use TLS and keep spam complaint rates below 0.3%. Senders of more than 5,000 messages a day to Gmail must set up SPF, DKIM and DMARC and offer one-click unsubscribe. For a small business: configure the domain properly once, and never buy lists.

Metrics that matter

• Clicks and replies over opens: opens have become less reliable because of privacy features in some email clients.
• Unsubscribes and spam complaints after each send.
• Conversions: inquiries, quotes, purchases.
• List growth from lawful sources.

A typical scenario

Picture a wine shop with an online store and 2,000 contacts: half customers, half newsletter sign-ups. The owner writes a newsletter a month, when there's time. With AI, the week's notes become a draft in minutes, with a subject line and two variants for regulars and new subscribers. The owner rereads, fixes the tone, checks prices and vintages, and writes to past customers under the soft opt-in only about similar products.

Common mistakes

1. Buying or "finding" lists.
2. Sending AI copy without proofreading.
3. Over-personalizing.
4. Using the soft opt-in for everything.
5. Ignoring domain authentication.

Read next

This guide is part of the dossier on AI for small business marketing. The best lists come from an orderly CRM with recorded consents, and newsletters that sell talk about well-described products: see AI for product pages. To win back inactive customers, read how to grow sales with AI.

The merchants' couriers rode because their letters were expected. If you want newsletters your customers are glad to open, see what we do for marketing and book a free intro call.