Mailchimp

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Do not build this to save money without checking the bill first — this is the subscription people most often outgrow by accident.

Sending reputation built over years is the real product, and it is the ordinary argument: the software is a fortnight, the warmed infrastructure is what you pay for.

FIRST, THE PRICING TRAP
- Priced by contacts stored, not by mail sent. A large list you mail rarely is the worst case, and it is extremely common
- Unsubscribed and bounced addresses often still count. Clean the list and the bill can drop immediately, with no migration at all
- Do that before deciding anything. A great many people leave over a price they could have halved in an afternoon

WHEN TO KEEP PAYING
- You mail often enough that reputation and deliverability are doing real work
- Somebody non-technical builds the campaigns

WHEN TO BUILD
- A modest list, a plain template, and a developer already in the room. Listmonk or a small application over a bulk provider covers it — the shape is under MailerLite and Sendy elsewhere in this catalogue

IF YOU BUILD IT, THE PARTS THAT MATTER
- One delivery row per subscriber per campaign, written before sending, so a resume is exact and a duplicate impossible
- Bounces and complaints from the provider: hard bounce unsubscribes, complaint unsubscribes permanently and is never mailed again
- SPF, DKIM and DMARC on a dedicated sending subdomain, warmed slowly. A new domain sending twenty thousand on day one stays in spam
- Complaint rate watched daily; above a fraction of a percent the provider suspends you
- One-click unsubscribe with no login, plus the List-Unsubscribe headers the large providers now effectively require

AND THE EXPORT TO TAKE NOW
Export the list with its consent dates and signup sources, whatever you decide. Those dates are what make the list legally usable, they are easy to lose in a migration, and they cannot be reconstructed.

THE ONE-LINE VERSION
Clean the list and re-read the bill before doing anything else. Then export your consent dates.