How campaign sending schedules & pacing work

The short version

Your cold email campaign decides when each email goes out using three simple rules, all designed to keep you landing in the inbox:

• A sending window you choose. You pick the hours (for example 9:00 AM to 5:00 PM) and the days of the week. Emails only ever send inside that window, in the time zone you set for the campaign — never outside it.
• Even pacing across your window. Your emails for the day are now spread out evenly across your whole window instead of firing all at once in the first minutes. Gentle, steady sending is what protects your deliverability.
• A daily limit. Each campaign (and your plan) has a daily cap. Once you reach it, sending pauses for the day and picks back up the next day. That's normal and it protects your sender reputation.

So if you ever see a campaign marked Running with only a few emails sent — or none yet — that is almost always one of these rules doing its job, not a problem to fix. This guide explains each rule with a worked example, and clears up the most common question: "why isn't my campaign sending yet?"

WarmySender is a 4-pillar outreach platform — Cold Emailing, Email Warmup, LinkedIn Outreach, and Multichannel sequences. This page is about the Cold Emailing pillar: how your campaign schedules and paces its sends.

1. Your sending window (the hours & days you pick)

A sending window is the daily stretch of hours when your campaign is allowed to send. You set a start time and an end time — for example, 9:00 AM to 5:00 PM — and you choose which days of the week send (weekdays only, or including weekends). Outside those hours, and on days you've switched off, your campaign simply rests and waits for the next open window.

Your window is read in the time zone you choose for the campaign. So "9:00 AM to 5:00 PM" doesn't mean 9-to-5 wherever your computer happens to be — it means 9-to-5 in the campaign's time zone. Every time WarmySender shows you for the campaign, including the next email time, is shown in that same time zone so it always matches the window you set.

Your emails only ever send inside your window. If a send would naturally fall outside it — say, late at night — it's automatically held and goes out at the start of your next open window instead. The window is a firm boundary, not a suggestion. A short, focused window (like business hours in your prospects' time zone) is a healthy default: it lands your emails when real people are reading, and keeps your daily volume natural-looking.

Want the full time-zone details, including why a "next email" time can look like a different hour than your local clock? See How campaign sending windows & time zones work.

2. Even pacing — your day's emails spread evenly across the window

When you launch a campaign, WarmySender does not send every email the instant you press start. Instead, it takes the emails due to go out that day and spreads them evenly across your whole sending window — from the start of the window to the end — rather than bunching them all up at the beginning.

This is a deliberate improvement. Sending in one big burst at the top of your window (all in the morning) is one of the clearest fingerprints of automated bulk mail, and a fast way to land in the spam folder. Releasing your emails at a calm, regular rhythm across the day looks like a real person sending real email — which is exactly what keeps you in the primary inbox.

What it means for you day to day:

• Checking early shows only a few sent. If you look shortly after launching, or early in the window, you'll naturally see a low count so far. The rest are lined up to go out steadily through the day. Nothing is stuck.
• Your deliverability is protected. Even, unhurried sending is the pattern email providers trust — so more of your messages reach the inbox instead of spam.
• There's nothing to fix. You don't need to restart the campaign or change a setting. The count keeps climbing across the rest of the window on its own.

In short: "Running" with a count that rises gradually through the day is the system pacing your sends to keep you out of spam — not a sign that something stalled.

3. Your daily limit — sending pauses for the day, then resumes tomorrow

Every campaign has a daily limit — the most emails it will send in a single day — and your plan has an overall daily cap too. These limits exist to protect your sender reputation: sending a huge number of emails in one day, especially from a newer mailbox, is exactly what triggers spam filters and damages your standing with email providers.

When your campaign reaches its daily limit, it pauses sending for the rest of that day and automatically resumes the next day when your window opens again. Any prospects who didn't get an email today simply wait their turn tomorrow. This is completely normal — the campaign is still Running and healthy; it has just done its safe amount for the day.

If you want more emails to go out per day, you can raise the campaign's daily limit, add more connected mailboxes so your volume is shared across several senders, or move up to a plan with a higher daily cap. It's best to increase gradually rather than all at once, so your sending stays gentle and your reputation keeps building. To learn how warmup builds the reputation that lets you safely send more over time, see email warmup.

A worked example

Say you set up a cold email campaign with 120 prospects, a sending window of 9:00 AM to 5:00 PM (an 8-hour window), the campaign's time zone set to New York time, and a daily limit comfortably above 120. You launch it at 9:00 AM.

• The math. 120 emails spread evenly across an 8-hour (480-minute) window works out to roughly one email every ~4 minutes. So instead of 120 emails leaving in the first minute, they trickle out calmly all day long.
• 9:05 AM (New York time) — you check the campaign. It says Running with only a couple sent so far, and shows "Next email ~9:08 AM". That's exactly right: your 120 emails are being released about every 4 minutes, not all at once.
• Through the day — the sent count climbs steadily, one every few minutes, always inside the 9-to-5 New York window. By late afternoon the bulk of your 120 have gone out at a healthy, natural pace.
• 5:00 PM (New York time) — the window closes. If everything sent, you're done for the day. If a few remain (or you'd hit your daily limit earlier), they simply wait and go out tomorrow when the 9:00 AM window opens again. No email ever left before 9:00 AM or after 5:00 PM New York time.

So "Running but only a couple sent at 9:05" is the system doing its job: pacing your 120 sends evenly across the window, staying inside your hours, and stopping for the day if it reaches your limit.

Knowing when the next email goes out

You never have to guess when the next email will send. On a Running campaign, WarmySender shows a small on-screen indicator with the time of the next scheduled email — for example "Next email ~2:10 PM" in the campaign's time zone. If the very first emails are just starting to go out, it instead reads "First emails sending now…" so you know they're on their way.

This indicator is your at-a-glance confirmation that everything is on track. If it shows an upcoming time, your campaign is pacing normally — there's nothing else for you to do but let it run.

"Why isn't my campaign sending yet?"

If your campaign says Running but nothing has gone out, it's almost always one of two completely normal, expected reasons:

1. You launched it after today's window had already closed. If your window is 9:00 AM to 5:00 PM and you launch at 8:00 PM, there are no sending hours left today — so the campaign waits and starts at your next window open (for example, tomorrow at 9:00 AM). Same thing if you launch on a day you've switched off: it begins on your next active day. The on-screen "next email" indicator will show that upcoming start time.
2. It already reached today's limit. If the campaign has sent its daily allowance (or your plan's daily cap is reached), it pauses for the day and resumes tomorrow. This is the daily limit protecting your reputation, and it's working exactly as intended.

A third, gentler reason: right at the very start of your window, or in the first minutes after launching, you may see zero or just a couple sent while the even pacing begins releasing emails. Give it a little time inside your window and the count will start to rise. In every one of these cases the campaign is healthy — there's nothing to restart, re-launch, or reconfigure.

If your campaign shows Running but has genuinely sent nothing for a full day inside an open window that hasn't hit its limit, that's worth a closer look — email [email protected] with the campaign name and we'll check it.

Changing your window, days, time zone, or daily limit

You can adjust all of this in the campaign's schedule settings. Open the campaign, go to its schedule settings, and change the start and end times, the active days, the time zone, or the daily limit, then save.

Your upcoming sends automatically realign to whatever you change — you don't need to rebuild the campaign or re-enroll your prospects. If you widen the window or raise the daily limit, more emails can flow the same day (still paced evenly and still inside your hours). If you narrow the window or lower the limit, future sends simply follow the new, gentler schedule. A tip: it usually works best to send during your prospects' working hours rather than your own, which tends to lift open and reply rates.

Why we pace and cap instead of blasting

Even pacing, sensible windows, and daily limits aren't restrictions — they're deliberate protections. Email providers watch how you send, not just what you send. A sudden flood of identical-looking emails is the classic fingerprint of spam and the quickest route to the junk folder and a damaged sender reputation. Steady, human-paced sending inside sensible hours, kept to a safe daily amount, is what keeps you trusted and in the inbox.

This works hand in hand with email warmup, which builds and maintains your sender reputation in the background. Together, gentle pacing during campaigns and ongoing warmup are what get your cold emails reliably delivered. We'll always favor protecting your deliverability over sending faster — because a campaign that lands in spam helps no one.

Common questions

Why did my campaign send everything in the morning?

It shouldn't anymore. WarmySender now spreads your day's emails evenly across your whole sending window instead of releasing them all at the start. So a 9:00 AM to 5:00 PM campaign trickles emails out through the whole day at a calm, regular pace rather than firing them all in the first minutes. If you're used to seeing a big morning burst, the new even pacing is why your sends now look smoother and more natural — which is better for your deliverability.

Why does my campaign say Running but only a few (or zero) are sent?

Because sending is paced. Your emails are released evenly across your window instead of all at once, so early in the window — or right after you launch — you'll naturally see only a few sent so far. It can also mean you launched after today's window closed (it'll start at the next window open) or you already hit today's limit (it resumes tomorrow). In every case the campaign is healthy and there's nothing to restart or re-launch — the on-screen "next email" indicator shows when the next one goes out.

What happens when I hit my daily limit?

The campaign pauses sending for the rest of that day and automatically resumes the next day when your window opens. Any prospects not reached today simply wait their turn tomorrow. This is your daily limit protecting your sender reputation — sending too much in one day is exactly what triggers spam filters. The campaign stays Running and healthy; it has just done its safe amount for the day.

Can I change my sending window or time zone?

Yes. Open the campaign, go to its schedule settings, and adjust the start and end times, the active days, or the time zone, then save. Your upcoming sends automatically realign to the new schedule — you don't need to rebuild the campaign or re-enroll anyone. Future sends simply follow the updated window and always stay inside it.

How do I send more per day?

A few options: raise the campaign's daily limit in its schedule settings, add more connected mailboxes so your volume is shared across several senders (which is safer than pushing one mailbox harder), widen your sending window so there are more hours to send across, or move up to a plan with a higher daily cap. Increase gradually rather than all at once so your sending stays gentle and your reputation keeps building — and let warmup do its work so you can safely send more over time.

Why does it say Running but 0 sent, when my window is open and I'm under my limit?

Right at the very start of your window, or in the first minutes after launching, it's normal to briefly see zero sent while the even pacing begins releasing emails. Give it a little time inside your window and the count will start to rise; the "next email" indicator shows when the next one is due. If a campaign genuinely sends nothing for a full day inside an open window that hasn't hit its limit, that's worth a closer look — email [email protected] with the campaign name and we'll check it.

Will my emails ever send outside my sending window?

No. Your campaign emails only ever go out inside the hours and days you set, in the campaign's time zone. If a send would otherwise fall outside the window — for example late at night — it's automatically held and goes out when your next window opens. The window is a firm boundary, not a guideline. This applies to your first message and every follow-up.

Related guides

• How campaign sending windows & time zones work — Why the next-send time can show a different hour than your local clock
• Set up campaign sequences, delays & conditions — Build a multi-step campaign with wait times
• Send follow-ups in the same email thread — Thread step 2 onward under step 1
• See which recipients opened your emails — Track engagement once your campaign is live
• Full documentation — All guides
• Support — How to get in touch