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

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There’s no universal best time to send marketing email.

For B2B, research often points to a weekday mid-week, in the late morning. But those numbers diverge widely between sources and say nothing about your specific list.

The verdict: start on a Tuesday to Thursday morning, then let your own list decide. Send time is a fine-tuning dial; relevance and segmentation are the main switch.

Significant or coincidence? Test it with the free A/B test calculator.

What does research say about the best day and time to send marketing email?

Weekdays beat weekends in B2B, and the middle of the week often comes out strongest.

Various studies and email platforms publish benchmarks on send times. The broad line is strikingly consistent.

The pattern across sources

Across the sources, a recognisable pattern emerges:

• Strongest days: Tuesday, Wednesday and Thursday
• Weaker days: Monday, Friday and certainly the weekend
• Best hours: the late morning and the early afternoon
• Weakest hours: usually the late evening

We deliberately leave out hard percentages here. They differ too much by source to hold as a general truth.

What the big platforms say

The big platforms say more or less the same thing, with small differences in emphasis.

Mailchimp: activity peaks between Tuesday and Thursday, with a daily high around 10 in the morning. Its send time optimisation system confirms it, though it adds that no single day wins hands-down.

B2B marketers: a broader analysis of send times reports that nearly half of the B2B marketers surveyed see the most engagement between 9 and 12.

Brevo: it points to two daily peaks, around 10 in the morning and again around 3 in the afternoon.

Campaign Monitor: in an analysis of a large number of emails, it landed on Tuesday as the strongest day for clicks. Its email marketing benchmarks, based on 100 billion emails sent in 2021, put Tuesday’s click-through rate at 2.4%, and add that there isn’t too much variance between days.

Here’s the common starting grid in one picture:

Watch out for time zones

Mailchimp’s 10 o’clock is in the recipient’s own time zone. That detail matters for Belgian lists.

For example, say you send at 10 Brussels time. Your contacts in the UK get it at 9, and a US contact on the East Coast gets it at 4 in the morning.

Watch out: if your platform can send per time zone, switch it on. If not, split international contacts into their own segment.

Treat it as an indication

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, close to your audience’s working rhythm.

Why don’t those benchmarks apply to you?

Because general figures average thousands of lists that have nothing to do with each other.

Your audience has its own rhythm. Nobody else’s.

Different buyers, different inboxes

Think of three very different readers:

• A buyer at a manufacturing company: reads between production meetings
• The owner of a small business: might read email early, before the working day starts
• A manager at a large corporate: in meetings all morning, inbox after lunch

Those people open their mail at completely different moments.

The average from a benchmark hides all those differences.

Open rate has become less reliable

On top of that, most benchmarks steer on open rate. And that metric has become less reliable.

Apple introduced Mail Privacy Protection in 2021. With Protect Mail Activity on, Mail “downloads remote content in the background by default”, according to Apple’s privacy page on the feature.

So an open gets 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.

For example, a difference of a few percent between Tuesday and Wednesday could just as easily be noise.

Steer on what you can bank

This touches on a broader point we like to stress at Customer Impact: don’t 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 in the end, meetings

A well set-up marketing automation approach lets you measure exactly those signals instead of merely counting opens.

Delivery matters too: an email in the spam folder has no send time at all. Our guide to improving email deliverability covers that first.

How much does timing actually matter?

Less than most articles suggest.

Send time is a fine-tuning dial. It’s not a main switch.

The big win sits elsewhere

The big win in email marketing doesn’t 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 beats a generic email to your whole database. Even on a “bad” day, and even if the generic one goes out at the supposedly perfect moment.

The four levers, in order of impact

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 doesn’t get opened can’t 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 beats an email on a fixed schedule. That’s 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 place to put your energy.

Here’s that hierarchy in one picture:

Fix the big levers first

In other words: if your emails aren’t 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’s a workable approach for a small B2B team, in five steps.

Step 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.

Step 2: Test one variable at a time

Split your list and send the same email at two different moments.

Change nothing else. Otherwise you’ll never know where the difference came from.

Our guide to A/B testing email shows how to set up that split.

Step 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.

Record four things per test:

• the send day and hour
• clicks per variant
• replies per variant
• enquiries or booked meetings

That’s it. Keep the log in one sheet, so tests add up over the months.

Step 4: Be realistic about small lists

With a B2B list of a few hundred contacts, subtle differences aren’t statistically reliable.

So test on large, clear differences, such as morning versus afternoon. Test on your recurring flows, not on nuances of fifteen minutes.

For example, say you send to 400 contacts and split them 200 and 200. A gap of two or three clicks between the halves tells you nothing yet.

Our guide to statistical significance in A/B tests explains why. And A/B testing with low traffic shows what you can still learn.

Step 5: Let automation do the work

Many platforms send automatically at the moment that historically performed best per contact.

For recurring flows, that’s often worth more than hunting for the ideal hour by hand.

Not every plan includes automation, though. Brevo’s pricing page shows where it starts:

Brevo’s pricing page, US settings, billed monthly, 18 October 2026. Marketing automation only starts on Standard.

Our comparison of email marketing software shows what each tool includes.

Then look at the bigger picture

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. You’ll know which improvement is genuinely worth the effort.

Posting on social too? The same logic applies to the best time to post on LinkedIn.

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.

Does the best time differ for a newsletter?

The same rules apply, but a newsletter benefits most from a fixed rhythm readers can expect. Our guide on how to send a newsletter covers that setup.

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 conversations and enquiries.

We help Belgian B2B companies set up their B2B email marketing and automation that way, with honest advice about where the win is.

Contact us