My inbox rate looks great but I’m not receiving warmup emails
Both things can be true at once, and here is why: your Inbox Rate is a sending score. It measures the warmup mail this mailbox sent out and where it landed for the people who received it — their main inbox, or their spam folder. It says nothing at all about what arrives at your address. So a mailbox can read 99% and be perfectly correct while, in the same week, no warmup mail came in. The two numbers are pointed in opposite directions. Nothing is broken, nothing is being faked, and your Inbox Rate is not wrong — it is answering a different question from the one you are asking.
WarmySender runs your outreach on autopilot with AI agents, across Cold Email, Email Warmup, LinkedIn, Instagram and Multichannel sequences — plus real-time email verification. This guide covers an Email Warmup question: how to read a high Inbox Rate on a mailbox that is not receiving anything.
Why does warmup have a sending half and a receiving half?
Email warmup is an exchange. Your inbox sends friendly, real emails to other real inboxes, and other real inboxes send friendly, real emails to yours. Both directions matter, and both are what make warmup look to a mailbox provider like a healthy account that people are genuinely happy to hear from.
Because it is an exchange, every mailbox has two halves that are measured separately:
- The sending half — warmup emails going out from your address to other inboxes. We look in those receiving inboxes to see where each one landed. That is what your Inbox Rate is built from.
- The receiving half — warmup emails coming in from other inboxes to your address. This half has its own signals on the warmup page, and it is not part of the Inbox Rate at all.
A worked example
Say your mailbox sends about 40 warmup emails a day. Over the past week we were able to confirm where 250 of them landed. Of those 250, 249 reached the recipient’s main inbox and 1 went to spam. That is 249 divided by 250 — an Inbox Rate of 99.6%, and it is completely correct. Your mail is landing beautifully for the people you send to.
In that exact same week, zero warmup emails arrived at your address. Also completely correct, and also completely separate. One is a fact about mail leaving; the other is a fact about mail coming in. Neither one contradicts the other, because neither one is measuring the other.
If you want the arithmetic behind the percentage itself — what counts, what is set aside, and why a small sample swings around — that is covered in Understanding your warmup Inbox Rate.
Is my Inbox Rate wrong, then?
No. It is right, and it is worth having. A high Inbox Rate is the single best early sign that your cold email campaigns will reach the main inbox rather than spam, because it is measuring exactly that: real mail sent from your address, arriving at a real inbox, and landing in the right place. That is the whole point of running warmup, and it is the number to watch when you are deciding whether a mailbox is ready to carry a campaign.
So do not discount it. Just do not ask it a question it cannot answer. “Is my mail landing?” — yes, that is what it is for. “Is warmup arriving at this address?” — no, look somewhere else on the page for that, and the next section says where.
Where do I look to answer “am I receiving anything?”
Two places on your warmup page, both in plain language, neither of them a percentage:
- The received count on the mailbox row. Under each mailbox address you will see how much warmup has arrived over the last seven days, shown as a plain number next to how many days that mailbox has been active. This is the direct answer. If it reads 0, nothing has come in this week — whatever the Inbox Rate says.
- The note on that specific mailbox. If we have already spotted a problem on the receiving side, the mailbox carries a short note saying so: either “Not receiving warmup” or “Incoming warmup paused”. The note names which situation you are in, and the two are explained below. A mailbox with no note and a healthy received count is receiving normally.
The headline figures at the top of the page — Inbox Rate, spam share, total sent — and the health rating on each mailbox row are all built from the sending half. A mailbox that is receiving nothing can still show a green “Excellent” rating, because that rating is describing how its outgoing mail is doing.
What does “Not receiving warmup” mean?
It means that mailbox has not recorded an incoming warmup email for a few days, and we are flagging it rather than leaving you to notice on your own. Warmup keeps retrying that address on the normal schedule, which is what clears a passing delivery hiccup — but it cannot clear a cause on your side, such as a domain that is not set up to accept incoming mail, or a rule filing warmup somewhere you did not expect. So the note is a prompt to spend two minutes checking, not a promise that it is being handled.
The two-minute check: send that address an email from an outside account. If it lands in the inbox, the receiving side is healthy and the retries will do their work. If it never turns up, waiting will not help and the fix is on your side.
Your sending carries on untouched the whole time: warmup keeps going out, and your campaigns and sequences run on their normal schedule.
Full explanation: Warmup shows active but no emails are arriving.
What does “Incoming warmup paused” mean?
It means we deliberately stopped other inboxes sending warmup to that address, because messages sent there did not get through. Again, your own sending is completely unaffected — that mailbox keeps sending warmup, campaigns and LinkedIn messages exactly as before. Only the arriving half is paused, and only for that one address.
There are two kinds, and the note on the mailbox tells you which one you have:
- A short pause with a restart date. Given when the delivery problem looked like a passing one. It lifts by itself on the day shown in the note. Nothing to do.
- A pause with no restart date. This one holds until someone on our team reviews the address. Message us and we will check it — that review is also where we catch pauses that should never have been applied.
Full explanation, including the reasons an address gets paused and the cases where we paused too readily: Why is incoming warmup paused on my inbox?
What does the Inbox Rate cover, and what do the two notes mean?
Two small tables. The first is the sending-versus-receiving split; the second is the two incoming notes and whether each one clears by itself.
What Inbox Rate does and does not tell you
| What Inbox Rate tells you | What it does not tell you |
|---|---|
| Where the warmup mail this mailbox sent out landed for the people who received it | Whether any warmup mail arrived at this mailbox |
| How likely your cold email is to reach the main inbox rather than spam | Whether the receiving side of this address is working at all |
| Whether the sending reputation you are building is holding up | Whether the address is full, mistyped, or turning mail away |
| That the sending half of warmup is doing its job | That the receiving half of warmup is doing its job |
The two incoming notes
| Note on the mailbox | What it means | Does it clear by itself? | What you do |
|---|---|---|---|
| Not receiving warmup | The inbox has not received warmup for a few days. We spotted it and are restoring it. | Yes — automatically, usually within a few days | Nothing |
| Incoming warmup paused, with a restart date | We stopped other inboxes sending warmup there for a set period, because mail sent to the address did not get through. | Yes — on the date shown in the note | Nothing, though a test email is worth sending |
| Incoming warmup paused, no restart date | The same, but what came back looked like a lasting problem with the address, so it waits for a person. | No — it holds until we review it | Message us |
| No note at all | Nothing has flagged the receiving side for that mailbox. | — | Read the received count on the mailbox row |
What should I do, in order?
- Read the note on that specific mailbox. It names which of the two states you are in — catching up, or paused — and a paused one either shows a restart date or does not. That single detail decides everything below.
- Send it a test email from outside. From a personal account on a different provider, email the address and confirm it arrives. This is the most useful minute you can spend, because it tests exactly what warmup was failing to do.
- Check the mailbox is not full. When there is no space left, nothing can be delivered to it, warmup included. Clearing out old mail is usually enough. See Why is my mailbox full?
- If it is the kind that waits for a review, message us. Send the mailbox address, and tell us what your test email did — whether it arrived or not. Either answer points us straight at the cause, and an address that clearly receives fine is exactly the case we most want to hear about.
What not to do. Do not disconnect and reconnect the mailbox — that loses the warmup history it has already built, and it does not lift a pause or speed up a catch-up. Do not turn warmup off and on again. Do not change your warmup settings. None of those touch the receiving side, and the first one costs you real progress.
Why didn’t the screen make this obvious?
It should have, and it did not. Every headline figure on the warmup page is a sending measure, and nothing on that screen said so — which is why a mailbox that had received nothing for two weeks could sit there showing a high Inbox Rate and a green “Excellent” rating and look entirely fine. That is a fair thing to be confused by, and the confusion was ours to prevent. We have since put the receiving side on the same screen: each mailbox now shows how much warmup has arrived over the last seven days, and when something is wrong with the receiving half the mailbox says so in words rather than leaving you to infer it from a percentage that was never about receiving. If a number on your dashboard still reads as an answer to a question it is not answering, tell us — we would rather change the screen than explain it.
Frequently asked questions
Is my Inbox Rate wrong if nothing is arriving?
No, it is right — it is measuring the other direction. Your Inbox Rate describes the warmup mail this mailbox sent out and where it landed for the people who received it. It is not affected by, and says nothing about, whether warmup arrives at your address. So a mailbox can honestly read 99% while nothing has come in for weeks. Both facts are true at the same time because they measure opposite directions. To answer "am I receiving?", read the received count under the mailbox address on the warmup page and any note shown on that mailbox, rather than the percentage.
What does the Inbox Rate actually measure?
Of the warmup emails your mailbox sent that we were able to confirm, the share that landed in the recipient's main inbox instead of their spam folder. Here is a worked example: your mailbox sends about 40 warmup emails a day; over a week we confirmed where 250 of them landed; 249 reached the main inbox and 1 went to spam. That is 249 divided by 250, an Inbox Rate of 99.6%. Every part of that calculation is about mail leaving your address. Nothing in it is about mail arriving.
Does incoming warmup being paused hurt my sending or my campaigns?
No. Your sending is completely untouched. That mailbox keeps sending warmup out, your cold email campaigns keep running on their normal schedule, and your LinkedIn and multichannel sequences carry on exactly as before. What is paused is warmup arriving at that one address — one direction, one address, nothing else. The same is true of the "Not receiving warmup" note: it affects only the receiving half.
Why does a mailbox with nothing arriving still say “Excellent”?
Because that rating is built from the sending half. It describes how the mail this mailbox sends out is being received by other people, which can be excellent even while nothing is coming back in. It is not ignoring a problem and it is not stale — it is simply reporting on the direction it measures. The receiving side has its own signals: the received count under the mailbox address, and the note shown on the mailbox when we have spotted something. Read those to judge the receiving half.
How is “Not receiving warmup” different from “Incoming warmup paused”?
"Not receiving warmup" means that one inbox has not recorded an incoming warmup email for a few days. Warmup keeps retrying it on the normal schedule, which clears a passing delivery hiccup, but it cannot clear a cause on your side such as a domain that is not set up to accept mail — so it is a prompt to check, not a promise that it is handled. "Incoming warmup paused" means we deliberately stopped other inboxes sending warmup to that address, because mail sent there did not get through. A paused one comes in two kinds: a short pause that shows a restart date and lifts on that day, and one with no restart date that holds until someone on our team reviews the address. If your note has no restart date, message us.
Where do I check whether a mailbox is receiving warmup?
On the warmup page, look at the mailbox row rather than the headline figures. Under the mailbox address you will see how much warmup has arrived over the last seven days, shown as a plain count next to how many days that mailbox has been active — that is the direct answer, and a 0 means nothing came in this week. If we have already spotted a problem on the receiving side, that mailbox will also carry a short note saying either "Not receiving warmup" or "Incoming warmup paused", which tells you which situation you are in.
Does the receiving half actually matter, or is a good sending score enough?
Both halves matter. Warmup is an exchange: your inbox sends friendly, real mail to other real inboxes, and other real inboxes send mail to yours. The incoming side is part of what makes an account look genuinely healthy and well-used rather than send-only, so it is worth getting back to normal. How much you have to do depends on the cause — a passing delivery hiccup clears as warmup keeps retrying, a short pause lifts on the date it shows, and a cause on your side needs a change at your end. The two-minute test email tells you which you have. Meanwhile your sending, your Inbox Rate and your campaigns all keep running.
Nothing has arrived for two weeks — is that normal?
Two weeks is longer than a routine catch-up, so check the note on that mailbox. If it says "Not receiving warmup" and has done for more than a few days, tell us and we will look at that mailbox. If it says "Incoming warmup paused" with no restart date, it is waiting on a review from us, so message us with the address — it will not lift on its own. If there is no note at all and the received count is still 0, send yourself a test email from an outside account first, and tell us the result.
How do I test whether the address can receive mail?
From an outside account — a personal address on a different provider, not another mailbox on the same domain — send a plain email to the address and see whether it arrives. It is the closest thing to what warmup was trying to do, so the result is genuinely informative either way. If it arrives normally, the address is healthy and that is worth telling us. If it does not arrive, or comes back undelivered, that points straight at the cause: a typo in the address, a full mailbox, or a strict filter turning away senders it has not seen before.
Should I disconnect and reconnect the mailbox to fix it?
No, and it is worth being firm about this one. Disconnecting a mailbox loses the warmup history it has already built, which is real progress you paid for in time. It does not lift a pause, it does not speed up a catch-up, and it does not change anything about the receiving side. The same goes for switching warmup off and on, or changing your warmup settings. Leave it running, follow the steps above in order, and message us if the note on the mailbox has no restart date.
Related reading
- Understanding your warmup Inbox Rate — how the number is calculated and why a small sample moves it around
- Warmup shows active but no emails are arriving — what “Not receiving warmup” means, and why it needs no action
- Why is incoming warmup paused on my inbox? — the two kinds of pause, and how each one ends
- Why does warmup need incoming access? — why we need to see the receiving side at all
- Why is my mailbox full? — a full inbox turns warmup away; how to spot it and clear it
- How email warmup ramps up — what to expect in your first hour, first day, and first week
- What is my mailbox’s warmup score? — what the rating on each mailbox is built from
- Full documentation — Cold Email, Email Warmup, LinkedIn, Instagram and Multichannel guides
Still have questions? Email [email protected] — we respond within 24 hours on business days.