A newsletter is a regular email sent to people who have asked to receive it, sharing news, advice, offers or commentary from a business or individual. Unlike a one-off promotional email, it arrives on a predictable schedule and is meant to be worth opening for its own sake.
How a newsletter works
People join through a sign-up form on your website, at checkout, at an event or through a lead magnet. Their address goes into an email list held by an email service provider, which handles sending, unsubscribes, bounce management and reporting. You write each issue, choose who receives it, and send.
Most business newsletters follow one of a few formats: a digest of recent articles and news, a single in-depth piece of advice, a curated round-up of useful links, or a mix of updates and offers. The format matters less than consistency: subscribers come to expect a certain kind of email at a certain interval, and they unsubscribe when it changes without reason.
Reporting covers delivery, opens, clicks and unsubscribes. Open rates have been unreliable since Apple Mail Privacy Protection began preloading emails in 2021, so clicks, replies and actions taken are better measures of whether people value what you send.
Why it matters
A newsletter is one of the few channels a business owns outright. Search rankings shift, social platforms change what they show, and ad costs rise, but a list of people who chose to hear from you stays yours. For service businesses with long buying cycles, a useful monthly email keeps you in mind until the subscriber is ready to buy or recommend you.
UK rules shape how you build and run the list. Under PECR, you need prior consent before sending marketing emails to individuals, with one exception: the soft opt-in, which lets you email existing customers about similar products or services if they were given a chance to opt out when you collected their details and in every message since. Every send needs a working unsubscribe link, and you need records of when and how each person signed up. Many senders use double opt-in to confirm sign-ups and keep the list clean.
Mailbox providers set rules too. At the time of writing (October 2026), Gmail and Yahoo require bulk senders to authenticate their domain and offer one-click unsubscribe, and Outlook.com requires authentication from high-volume senders, so poor technical setup can send a newsletter to spam however good the content.
Common mistakes
- Adding customers, contacts or business cards to the list without consent or a valid soft opt-in.
- Sending only when there is something to sell, so subscribers learn every email is an advert.
- Starting a weekly schedule you cannot keep, then going quiet for months.
- Judging success by open rate alone, which privacy features have distorted.
- Ignoring email deliverability: missing SPF, DKIM or DMARC records, or never removing addresses that bounce.
- Making the unsubscribe link hard to find, which leads to spam complaints instead.
How to act on it
Decide what your newsletter is for and what a subscriber gets from it, in one sentence, and put that sentence on the sign-up form. Choose a frequency you can sustain for a year; monthly is realistic for most small businesses.
Set up the basics properly: an email service provider, domain authentication, a consent record for every subscriber and a clear unsubscribe link. Make most of each issue genuinely useful, with one clear call to action, and measure clicks and enquiries rather than opens.
Review the list a few times a year and remove people who have not engaged for a long time. If you want help deciding where a newsletter fits among your other channels, that is part of the digital marketing strategy work I do with UK businesses.