Email course or newsletter: which one to write

The ask is different, and that is the whole thing

Subscribing to a newsletter is an unbounded commitment to an unknown quantity. The reader does not know how often it arrives, how long it is, how long it will keep arriving, or whether the third one will be as good as the first. Rationally, the only way to find out is to let a stranger into the place where their bank sends statements and hope for the best. This is why newsletter sign-up rates are what they are, and no amount of copy fixes it, because the problem is structural rather than persuasive.

A course is bounded on every axis the reader cares about. Five emails. One a day. Here is what each one is about. It ends on Friday. The decision is small because the exposure is small, and the reader can evaluate the offer in full before accepting it. That is the mechanism, and it is worth understanding it as a mechanism rather than as a marketing trick: you are not persuading harder, you are asking for less.

There is a corresponding difference at the other end. A newsletter has no ending, so the only way out is an unsubscribe — a small negative act that many people perform with a faint sense of having let someone down, and which they therefore postpone by simply not opening anything. A course ends by finishing. The last email is a real moment rather than a gap in a sequence, and a reader who finishes has actually completed something. Those are much better terms on which to ask for whatever you ask for next.

Which one is your idea, actually

The simplest test is whether your idea has a natural end. If you can write down what the reader will be able to do when it is over, it is a course. If the honest answer is “keep receiving my thoughts on this subject”, it is a newsletter. Forcing one into the other is where both formats go wrong: a course with no destination is a newsletter with an arbitrary stopping point, and a newsletter written as five acts runs out of acts.

The second test is about supply. A newsletter is a standing obligation. Publishing weekly means fifty-two pieces a year, indefinitely, and the honest question is whether you will still want to write it in March. A course is written once and delivered from then on to everyone who joins, in their own time, starting from the day they confirm. The work is front-loaded and finite.

Rough signals, when the answer is not obvious:

• You have a method, a process or a sequence of steps → course.
• You have a beat to cover, a field to follow, or opinions that keep arriving → newsletter.
• You want something that works while you are not writing → course.
• You want a relationship that compounds over years → newsletter, and probably a course as the door into it.
• You are not sure you will still care in six months → course, certainly. It will keep working after you have stopped thinking about it.

The usual answer is both, in one order

For most people writing for a subject they know, the productive arrangement is a course as the front door and a newsletter behind it. The course is what a stranger agrees to, because the ask is small and legible. The newsletter is what the last day of the course invites a finisher to join, at the exact moment the reader has spent five mornings with you and can actually judge whether they want more.

That ordering also solves the hardest problem in newsletters, which is that issue one goes to nobody. A course that ran for a month has produced a set of people who have read five things you wrote and finished them. They are a far better audience for a first issue than a list of strangers who clicked a form once, and they arrive continuously rather than in a launch spike.

The reverse arrangement — a newsletter that occasionally mentions a course — works much less well, for the reason at the top of this page: you are asking the larger question first, to people who have no basis for answering it.

What each one costs to keep running

A newsletter costs attention, permanently. It has a cadence to hold, an archive that becomes a promise, and a slow decay in list quality that has to be actively managed: addresses go stale, people change jobs, engagement drifts down, and a list that is mailed without pruning eventually damages the reputation it depends on. None of that is difficult, but all of it is ongoing.

A course costs a burst of writing, a read-through on a phone, and then almost nothing — with two exceptions worth knowing about before you start. The first is that a course dates. A sequence written against a tool, a price or a platform will quietly become wrong, and because nobody is watching it go out, nobody notices. Put a review date in your calendar the day you publish it. The second is that a course’s one moment of real risk is the confirmation step: everything that happens after it is automatic, so anything broken there is broken silently for everyone.

Both formats share the same legal and deliverability floor, and it is not optional for either: a real postal address in every message, an unsubscribe that works immediately and is honoured everywhere, authentication set up properly on the sending domain, and a sender name that matches the one the reader agreed to. A course does not get a lighter version of these because it is short.

If it is a course, five to ten days

Under five, there is not enough rhythm for the reader to form the habit of expecting you, and the whole benefit of daily delivery is the habit. Over about ten, the completion rate falls off a cliff — a two-week daily commitment is a different kind of ask from a one-week one, and the people most likely to abandon it are the ones who were most enthusiastic at sign-up, which is the worst possible group to lose.

Five is the default for a reason: it is a working week, the end is visible from the start, and it fits the gap between deciding to do something and losing interest in it. Ten is the sensible ceiling for a subject that genuinely needs the room. If your material will not fit in ten, you do not have a longer course — you have two courses, or a book.