MailerLite AI: The Writing Tools Are Included, the MCP Server Is the Real Feature

MailerLite's AI comes in two parts. Built-in tools write and optimise inside the app: an AI writing assistant, a subject line generator, smart sending and an AI landing page builder. And an MCP server lets outside assistants, Claude and ChatGPT among them, read and act in your account. The second part is the more interesting, and it is the reason MailerLite now describes its top plan as "Best for frequent senders, teams and AI agents." ^[2]

This page covers what each part does, what each plan includes, what the terms say, and how to use it without creating problems for your account.

What MailerLite's AI includes

From the pricing page's comparison table and plan-change notice ^{[2] [4]}:

• AI writing assistant, for drafting and rewriting email copy. From Comfort.
• Smart sending, which helps time campaigns. From Comfort.
• Subject line generator, limited on Free.
• AI landing page builder, limited on Free.
• MCP server, connecting AI assistants to your account. Limited on Free; full on paid plans.
• Claude integration and ChatGPT integration, built on the MCP server.

Nothing is sold as credits or charged per use. That is simpler than products that meter AI and removes a whole category of surprise on the bill. It also means the vendor publishes no usage ceiling, model name or provider.

The June 2026 plan change moved the writing assistant and smart sending down to Comfort. Before that they sat on the higher plan.

## The MCP server, in plain terms

MCP, the Model Context Protocol, is a standard way for AI assistants to use outside tools. MailerLite publishes an MCP server, which means an assistant you already use can connect to your MailerLite account and work in it with your permission.

The vendor's examples show the range ^[9]:

• "Turn the blog post below into a 100 word email summary."
• "Show me everything about subscriber jane@example.com, including recent activity."
• "Find where subscribers are dropping off in my onboarding automation."

The first is drafting. The second is looking something up that would otherwise take several clicks. The third is analysis across an automation's reports. The vendor's own description is that the connection turns assistants into "a personal email marketing assistant that can draft campaigns, troubleshoot automations, and take action on your behalf." ^[9]

"Take action" is the important phrase. An assistant with full access can create and change things in your account, not just read them.

What each plan allows

On Free, the MCP connection and the API are limited, and the vendor is clear about the most important limit: "Email sending via the API and MCP server is available on paid plans. On Free, API and MCP access is limited and doesn't include sending." ^[2]

So on Free an assistant can help you prepare, but you send. On Comfort and Power, an assistant can send.

That makes the sending allowance relevant. Comfort allows ten times the top of your subscriber band each month, and exceeding it upgrades the plan automatically ^[3]. An assistant that sends test campaigns or resends to segments uses the same allowance as you do. Power is unlimited under fair use, which is why the vendor positions it for AI agents.

The built-in tools follow a simpler rule. The writing assistant and smart sending need Comfort or above; the subject line generator and landing page builder are limited on Free.

## Getting started with Claude or ChatGPT

The setup the vendor describes takes about a minute: connect the MCP server from the assistant's side, authorise it for your MailerLite account, and start asking ^[9].

Three things to decide before you connect.

Which account. If you manage several MailerLite accounts, connect only the one you mean to work in. An assistant does what you ask in whatever account it can reach.

Which user. Connect with a user whose role matches what you want the assistant to do. If it only needs to read reports and draft, a user with limited permissions is safer than the owner.

Which plan. On Free, accept that the assistant cannot send. On Comfort, watch the sending allowance.

Start with read-only tasks: summarise last month's campaigns, find where an automation loses people, list subscribers who clicked a specific link. Move to drafting next, and to sending last.

Drafting campaigns with AI

The most common use is drafting. Either the built-in writing assistant on Comfort, or an outside assistant through MCP, can turn notes, a blog post or a product page into a campaign.

What works:

• Give the assistant your own material, a post or notes, rather than asking it to invent content.
• Ask for a short version first; it is easier to expand than to cut.
• Keep your sender voice by giving it two of your past campaigns as examples.
• Read every draft as a subscriber would before sending.

What to avoid:

• Claims you have not checked. An assistant can state a price or a date confidently and wrongly.
• Subject lines built on urgency that is not true. They work once and cost trust afterwards.
• Long emails. AI drafts run long; your readers do not.

The value is speed on the first draft, not judgement on the final one.

## Analysis and troubleshooting

The less obvious use is analysis, and it is where MCP earns its place.

An assistant connected to your account can answer questions that otherwise need several reports and a spreadsheet: which campaigns had the most unsubscribes this quarter, which automation step loses the most people, which segment clicked most on a pricing link. The vendor's own example, finding where subscribers drop off in an onboarding automation, is exactly this ^[9].

It can also help with billing questions, as long as you check its answer against the vendor's billing page. Ask it how many active subscribers you have touched in this cycle, and compare with your band. MailerLite counts any address "that was Active at any point during the cycle", including deleted ones ^[3]; an assistant that counts today's list will give you the wrong band.

Treat the assistant's numbers as a starting point and confirm the ones you act on.

Letting an assistant take action

The step from "suggest" to "do" is where care matters.

An assistant with access can create campaigns, change automations, move subscribers between groups and, on a paid plan, send. Each of those has consequences that a person would usually check:

• A campaign sent to the wrong segment cannot be unsent.
• An automation changed while live affects everyone currently in it.
• Subscribers imported or moved into a sending group without consent are an account-review risk.

The last point deserves emphasis. During an account review, "email sending and landing page publishing, will be temporarily paused" ^[8], and the terms allow termination "with or without cause". An assistant that imports a list on your behalf creates the same risk as you importing it.

A safe pattern: let the assistant draft and prepare, and keep the final send, the import and any change to a live automation as steps a person confirms.

## What the terms say about AI

The terms have a section on AI-powered features. They define them as MailerLite's native AI functionalities and the MCP connection, and treat any use of them as part of your use of the service ^[8].

Two clauses matter in practice. First, the vendor may "modify, suspend, or terminate AI-Powered Features, including access to the MCP or specific AI Agent integrations, without liability" ^[8]. So do not build a business process that stops if the MCP connection does.

Second, the fair use section applies to anything unlimited. If usage places "undue burden" on the systems, the vendor will contact you and may limit, suspend or terminate access "without entitlement to a refund of amounts previously paid" ^[8]. An assistant running in a loop is the kind of usage that clause exists for.

What the terms do not tell you, in the sections we read, is which models power the built-in tools or how content sent to them is processed. If that matters for your data, ask before you use them on subscriber information.

AI and deliverability

AI drafting creates a quieter risk: more email, faster. If an assistant makes it easy to send three campaigns where you used to send one, your unsubscribes and complaints rise with them, and complaints are what account reviews look at.

MailerLite gives you tools to send less and better. Smart sending, on Comfort and above, helps with timing. Segments let you send to people who engage rather than to everyone. Auto-resend can target non-openers, though it also uses the sending allowance.

A sensible rule: let AI improve the emails you would send anyway, not increase how many you send. Keep an eye on unsubscribes per campaign; a jump after you started using AI drafts is the first warning sign.

On Comfort, remember that every extra send counts against the ten-times allowance ^[2]. On the 2,500, 5,000, 10,000 and 100,000 bands, a month over that cap costs exactly what Power costs.

## Built-in AI by plan

Feature	Free	Comfort	Power
AI writing assistant	no	yes	yes
Smart sending	no	yes	yes
Subject line generator	limited	yes	yes
AI landing page builder	limited	yes	yes
MCP server	limited, no sending	yes	yes
Claude and ChatGPT integrations	limited	yes	yes

Sources: the pricing page's comparison table and the plan-change notice ^{[2] [4]}.

The pattern is simple. Free lets you try the AI around the edges. Comfort, at $12 a month for 500 subscribers, includes everything AI-related the product offers. Power adds nothing AI-specific; what it adds is unlimited sending, which matters only if an assistant sends a lot.

A week with an assistant: a worked example

A newsletter writer with 1,800 subscribers on Comfort connects Claude through the MCP server.

Monday. She asks for a summary of last month's four campaigns: opens, clicks and unsubscribes, side by side. It takes a minute instead of four reports.

Tuesday. She pastes a blog post and asks for a 100-word email summary, one of the vendor's own example prompts ^[9]. She edits the draft for voice and keeps two of its three paragraphs.

Wednesday. She asks where people drop out of her onboarding automation. The answer points to the third email, which has half the opens of the second. She rewrites it herself.

Thursday. She asks the assistant to build a segment of subscribers who clicked a pricing link in the last 30 days. She checks the segment's size against her own expectation before using it.

Friday. She schedules the week's campaign by hand.

Her sends that week: one campaign to 1,800 people plus the automation's usual traffic. With 1,800 subscribers she is in the 2,500 band, so her Comfort allowance is 25,000 sends a month ^[2], and nothing the assistant did touched it. It saved her time on Monday, Wednesday and Thursday. It sent nothing.

Questions to ask before using AI on subscriber data

Before you connect an assistant to an account with real subscribers, answer these.

Does your privacy notice cover it? If subscribers' data will be read by an outside AI service, your notice should say so.

Which data does the assistant need? For drafting, none. For analysis, aggregate reports. For lookups, individual profiles. Give it the least it needs.

Who can connect? Decide which users may connect assistants, and with which permissions.

What happens to the content? The sections of the terms we read do not say how content sent to AI features is processed or which providers are involved. Ask the vendor if it matters to you.

What is the fallback? The terms let the vendor change or withdraw AI features without liability ^[8]. Keep a manual way to do anything your business depends on.

How MailerLite's AI compares

Among the email platforms we have measured, MailerLite's AI is notable for two things: a published MCP server with named integrations, and no separate AI charge.

Klaviyo publishes its AI pricing in detail, with a monthly fee, included credits and a rate per thousand credits, plus its own connectors for ChatGPT and Claude. That is more specific than MailerLite about what you are buying, and more expensive. Constant Contact includes AI copy tools on every tier but publishes no model, provider or ceiling, and no developer surface we could read.

We score MailerLite 3.4 out of 5 on AI. It earns credit for the MCP server, for including the tools in the price, and for stating clearly which plans can send through AI. It loses credit for publishing nothing about models, data handling or limits, and for the terms' right to change or withdraw AI features without liability.

Practical setups by user

A solo creator on Free: use an assistant through MCP to draft and analyse; send by hand. Upgrade to Comfort when you want the built-in writing assistant or AI sending.

A small business on Comfort: use the built-in writing assistant for drafts and MCP for analysis. Watch the sending allowance if an assistant sends.

A team or agency on Power: connect assistants with role-limited users, keep imports and live automation changes as human steps, and document which assistant can do what.

Anyone handling sensitive subscriber data: ask the vendor how AI features process content before using them on that data.

## The verdict

MailerLite's AI is practical rather than headline-grabbing. The built-in writing assistant and smart sending are useful and included from $12 a month. The MCP server is the real feature: it lets the assistant you already use draft, analyse and act in your account, and it is documented well enough to use with confidence.

Use it for speed and analysis. Keep the decisions that cannot be undone, sending, importing and changing live automations, with a person. And keep the account's consent records in order, because an assistant can create an account review as easily as you can.