Best time to send marketing email: what actually works in B2B?

The honest summary first: there is no universal best time to send marketing email. For B2B, research often points to a weekday in the middle of the week and the late morning, but those numbers diverge widely between sources and say nothing about your specific list. In practice, optimising send time delivers a marginal gain. The big levers are relevance and segmentation. In this article you will read what the research says, why you should take those benchmarks with a pinch of salt, and how to test the best time on your own list.

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What does research say about the best day and time?

Various studies and email platforms publish benchmarks on send times, and the broad line is strikingly consistent: for B2B, weekdays perform better than weekend days, and the middle of the week often comes out strongest.

Across the sources, a recognisable pattern emerges. The strongest days sit mid-week, with Tuesday, Wednesday and Thursday on top, while Monday, Friday and certainly the weekend perform more weakly. In terms of time of day, the late morning and the early afternoon come out best every time, while late evening usually scores lowest. We deliberately leave out hard percentages here, because they differ too much by source to hold as a general truth.

The big platforms say more or less the same thing, with small differences in emphasis. Mailchimp sees activity peak between Tuesday and Thursday, with a daily high around 10 in the morning, something their send time optimisation system confirms. A broader analysis of send times reports that nearly half of the B2B marketers surveyed see the most engagement between 9 and 12. Brevo points to two daily peaks, around 10 in the morning and again in the afternoon around 3, and Campaign Monitor, in an analysis of a large number of emails, landed on Tuesday as the strongest day for clicks.

Treat these numbers as an indication, not as truth. They differ by study, by country, by sector and by year. The pattern that remains is thin but usable: in B2B you send on a weekday, and closer to your audience’s working rhythm than far outside it.

Why don’t those benchmarks apply to you?

The problem with general figures is that they are an average of thousands of lists that have nothing to do with each other. Your audience has its own rhythm.

Think of the difference between a buyer at a manufacturing company, the owner of a small business and a marketing manager at a large corporate. Those people open their mail at completely different moments. An owner might read email early, before the working day truly begins. A manager at a large company may sit in meetings all morning and only touch their inbox after lunch. The average from a benchmark hides all those differences.

On top of that, most benchmarks steer on open rate, and that metric has become less reliable. Since Apple introduced Mail Privacy Protection in 2021, Apple mail clients preload images automatically. As a result, an open is registered even if the recipient never actually looked at the email. That inflates open rates artificially and makes it hard to judge send times purely on opens. A difference of a few percent between Tuesday and Wednesday could just as easily be noise.

This touches on a broader point we like to stress at Customer Impact: do not steer on open rate as a goal in itself. A high open rate is nice, but you pay your bills with customers and revenue. So optimise for what counts: clicks, replies, enquiries and ultimately meetings. A well set-up marketing automation approach lets you measure exactly those signals instead of merely counting opens.

How much does timing actually matter?

Honestly: less than most articles suggest. Send time is a fine-tuning dial, not a main switch.

The big win in email marketing does not lie in choosing between 10 or 11 o’clock. It lies in whether you send the right message to the right person. A relevant email to a well-segmented list still performs better on a “bad” day than a generic email to your entire database at the supposedly perfect moment.

In order of impact, the hierarchy looks roughly like this:

• Relevance and segmentation. Who receives this email, and is it genuinely relevant to them? This is where most is to be gained. Read how to approach it in segmenting your email list.
• The subject line. An email that does not get opened cannot convert either. Strong subject lines in B2B weigh far more heavily than the hour you send.
• The trigger and behavioural timing. An email that goes out because someone did something performs better than an email on a fixed schedule. That is the core of behavioural email marketing.
• The calendar moment (day and hour). Only here does the classic “best time to send marketing email” come into view. Useful to optimise, but not the first thing to put your energy into.

In other words: if your emails are not segmented yet and your subject lines are weak, fiddling with the send hour is a waste of time. Get the big levers right first.

How do you find the best time for your own list?

The only reliable best time is the one your list shows you. Here is a workable approach for a small B2B team.

1. Start from a logical starting point. Use the benchmarks as a point of departure, not as an endpoint. For B2B, a weekday somewhere between 9 and 2 is a reasonable bet to start with.
2. Test one variable at a time. Split your list and send the same email at two different moments. Change nothing else, otherwise you will never know where the difference came from.
3. Measure on clicks and enquiries, not just opens. Because of the privacy updates, open rate is prone to noise. Look at what people do afterwards: click, reply, fill in a form.
4. Be realistic about small lists. With a B2B list of a few hundred contacts, subtle differences are not statistically reliable. In that case, test on large, clear differences (morning versus afternoon) and on your recurring flows, not on nuances of fifteen minutes.
5. Let automation do the work. Many platforms send automatically at the moment that historically performed best per contact. For recurring flows, that is often more valuable than hunting for the ideal hour by hand.

Want to map the broader return of your email programme before you fiddle with timing? Then start with measuring the ROI of email marketing in B2B, so you know which improvement is genuinely worth the effort.

Frequently asked questions

What is the best day to send a B2B email? Research usually points to a weekday in the middle of the week, with Wednesday, Tuesday and Thursday on top. Weekend days generally perform weakly in B2B. But this is an average: test it on your own list before you accept it as truth.

What is the best time of day? The late morning and early afternoon come out as strong in most benchmarks, roughly between 9 and 2. Late evening usually scores lowest. The time that fits your audience’s working rhythm weighs more heavily than a general average.

Is open rate still a reliable metric? Less than it used to be. Since Apple’s Mail Privacy Protection (2021), opens are partly registered automatically, which inflates the figures. So steer on clicks, replies and enquiries instead of on opens alone.

How much better does my email get by optimising the send time? Usually marginally. Timing is fine-tuning. The big win lies in relevance, segmentation and strong subject lines. Optimise those first, and only then the send moment.

Want email that steers on customers, not on opens?

The best time to send is a detail within a much bigger whole. What really makes the difference is relevant email to the right people, measured on what it delivers in conversations and enquiries. We help Belgian B2B companies set up their email and automation along those lines, with a small team that gives honest advice about where the win is.

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