Email delivery rate is the percentage of your sent emails that recipients’ mail servers accepted, whether they landed in the inbox, promotions or spam.
The formula is delivered divided by sent, times 100, and healthy is 98%+ for opt-in mail or 95%+ for cold email.
The confusion this page exists to clear up is simple. Delivered does not mean inboxed. That gap is where most senders lose their replies.
Let’s learn what it counts, how to work it out, what’s good in 2026, and what to check when it drops. The broader discipline of email deliverability is a separate subject.
Key Takeaways
- Delivery rate = (delivered / sent) x 100.
- “Delivered” means the receiving server accepted the message. It could be sitting in spam.
- Aim for 98%+ on opt-in mail and 95%+ on cold email.
- Delivery rate is not inbox placement rate. They measure different things.
- A 99% delivery rate alongside flat replies is an inbox placement problem, not a delivery problem.
What Is Email Delivery Rate?
It’s the share of your send that the receiving mail server took off your hands, and nothing more.
“Accepted” has a precise meaning. The server returned a 2xx response and took the message. It says nothing about which folder that message went to, or whether a human ever saw it.
Twilio SendGrid defines delivered as “the percentage of messages that were successfully accepted by your recipients’ mailbox providers”. It adds a caveat almost nobody repeats: a provider can accept a message and then silently delete it.
Litmus is blunter: an email counts as delivered if it didn’t bounce.
So the metric isolates one thing: whether your list and infrastructure are sound enough for servers to take your mail at all. That’s useful. It’s also a smaller claim than most people think they’re reading.
How much smaller? Mailjet surveyed senders and found 88% couldn’t define the metric correctly. Only around 12% knew it counts mail delivered to spam, which is the gap this next section closes.
What’s the Difference Between Delivery Rate, Deliverability and Inbox Placement?
That 88% figure has a practical consequence: most senders read a 99% delivery rate as “99% reached the inbox“. It does not mean that, and the difference is the rest of this page.
Think of a parcel at an office building. Delivery is it being accepted at the door. Placement is which floor it reaches. Deliverability is whether the building lets you in at all.
Validity draws the same line: deliverability is “a sender’s ability to reach the inbox, not the spam folder. Not to be confused with the delivery your ESP shows, which only tracks whether the recipient’s mail server accepted an email.”
| Metric | What it counts | Formula | Where you see it | Healthy in 2026 |
|---|---|---|---|---|
| Delivery rate | Accepted by the server: inbox, promotions or spam | (delivered / sent) x 100 | Your ESP dashboard | 98%+ opt-in, 95%+ cold |
| Inbox placement rate | Landed in the primary inbox | (inbox / sent) x 100 | Seed-list testing only | Global 87.2% (Validity, 2026) |
| Deliverability | The discipline: reputation, authentication and list hygiene | Not a single number | Placement plus spam and missing rates | Global average inbox placement runs at about 83.1% |
Work a real send through it: you send 1,000 emails, 950 are accepted, and 760 reach the primary inbox.
Your delivery rate is 95%, and your inbox placement rate is 76%. Both numbers are correct. Only one of them is about whether anyone read your email.
One thing no ranking page tells you: there are two conventions for calculating placement.
Validity counts inbox out of total sent. Mailjet counts it out of delivered. The send above reads 76% one way and 80% the other, from identical data.
We use inbox divided by total sent, because mail that never arrived is part of the outcome. Before comparing your placement to any published benchmark, check which convention it used.
One line to remember. If your ESP shows 99% delivered and your replies are flat, delivery isn’t your problem.
How Do You Calculate Email Delivery Rate?
Delivery rate = (delivered / sent) x 100
You’ll also see it as ((sent minus bounced) / sent) x 100, which is the same calculation, because delivered is simply sent minus bounced.
A worked example: you send 1,000 emails and 50 bounce, so 950 were delivered and your delivery rate is 95%.
“Sent” means emails attempted: not sent minus suppressed, not sent minus anything else. If your platform attempted it, it belongs in the bottom of the fraction.
What your ESP might count differently. Platforms bucket failures their own way, and it changes your number.
SendGrid separates Processed from Delivered and reports Bounces and Blocks separately, so blocked mail may sit outside the figure you read. Check what yours counts as a bounce and what it counts as a block.
What Is a Good Email Delivery Rate?
Published thresholds run from 89% to 99.5%, which looks like disagreement and mostly isn’t, because the sources measure different kinds of mail.
| Source | “Good” | Warning level | Dated |
|---|---|---|---|
| ReviewMyEmails | 98%+ healthy, 99.5%+ great | Below 97% | Not dated |
| MessageFlow | 98 to 99% | Not stated | Not dated |
| Omnisend | 95 to 99% (ecommerce) | Below 90% critical | Jun 2026 |
| MailReach | 95 to 99% | Below 85% | Sep 2025 |
| Litmus | 95%+ | Below 80% | 2024/25 |
| AgencyAnalytics | 90 to 98% | Below 80% | Not dated |
| TrulyInbox | 98%+ opt-in, 95%+ cold | Below 95% on cold means a list audit | 2026 |
Here’s why we land where we do. Validity’s 2025 report puts global bounce for permission-based mail at around 1.5%, implying delivery near 98.5% across ESPs.
Treat that as a March 2025 estimate derived from bounce rate. Validity’s 2026 material publishes no global delivery figure.
Cold email is different, and the honest source is vendor data. Saleshandy reports 95.2% inbox placement and 2.2% blended bounce across 53.1 million cold emails, January to June 2026.
That’s their methodology on their own network, and it matches what we see.
So below 95% on cold, stop and audit the list before you send again.
Why Does Your Delivery Rate Drop?
Three causes account for nearly all of it, and they are worth separating before you act.
Bounces, Hard and Soft
A hard bounce is permanent: the address doesn’t exist, the domain doesn’t resolve, or your IP is blocked. A soft bounce is temporary, like a full mailbox. Hard bounces should be suppressed the moment they appear.
Published thresholds vary by source. Mailmodo calls below 2% good, and Saleshandy puts good under 2% with danger above 5%.
Klaviyo is the most specific. Below 99% successful delivery with bounce above 0.15% means clean your lists, and it suppresses a profile after seven soft bounces. Validity puts global permission-based bounce near 1.5%.
We aren’t publishing a TrulyInbox bounce threshold yet, because we haven’t settled one we can stand behind. Treat a sustained rise as the signal, whatever the absolute figure happens to be.
Blocks and Authentication Rejections
This is the cause most articles skip, and it’s where a lot of lost delivery now comes from, especially on cold sending.
When SPF, DKIM or DMARC fail, receiving servers reject the message outright with a 4xx or 5xx response. Those rejections count as bounces, so they pull your delivery rate down directly.
Spam complaints work differently. They damage where mail lands rather than whether it’s accepted, so a complaint problem shows up in placement while delivery looks fine.
List Quality
Old lists decay, because people leave jobs, addresses get retired and domains lapse.
Verify before sending, know where each address came from, and distrust anything you didn’t collect. A purchased list is the fastest route to a delivery problem no tuning will fix.
Which Gmail, Yahoo and Microsoft Rules Affect Delivery?
These belong here because they’re the rules that turn into 4xx and 5xx rejections, which is delivery, not deliverability.
| Provider | All senders | Bulk senders, 5,000+ a day |
|---|---|---|
| SPF or DKIM, valid forward and reverse DNS, spam rate below 0.3%, RFC 5322 format | SPF and DKIM, DMARC at p=none or stricter, From alignment, one-click unsubscribe on marketing mail, spam below 0.10% | |
| Yahoo | SPF or DKIM, spam below 0.3%, valid forward and reverse DNS, RFC 5321/5322 | One-click unsubscribe, a visible unsubscribe link, unsubscribes honoured within two days |
| Microsoft | Not specified separately | From 5 May 2025, domains sending 5,000+ a day to Outlook.com, Hotmail and Live need SPF, DKIM and DMARC aligned at p=none or stricter |
Two details are worth holding onto here, and both change what you should be planning for.
Google calculates spam rate daily. Since June 2024 a bulk sender above 0.3% loses eligibility for delivery mitigation, and regains it only after seven consecutive days below that line.
On Microsoft the sources disagree, and it matters which you trust.
Microsoft’s own Tech Community post says non-compliant high-volume mail is routed to Junk from 5 May 2025. Outright rejection is reserved for a future date it hasn’t announced.
Several third-party write-ups say rejection began on 5 May. Plan against Microsoft’s wording, and treat rejection as the stated end state.
Where Can You Actually See Your Delivery Rate?
Your ESP’s logs, and that’s worth saying plainly, because the other tools people reach for don’t report delivery rate at all.
Google Postmaster Tools does not show delivery rate. It shows Gmail-side spam rate, delivery errors, authentication, encryption and compliance status, for personal Gmail recipients only.
One correction, because several widely-read pages get it wrong: Postmaster Tools v1 has not been retired.
Google announced 30 September 2025 and then postponed it, and its help page still says the deprecation is postponed with no new date.
What is going away is the Domain and IP Reputation dashboards, excluded from v2. Version 2 adds a compliance status dashboard.
Microsoft SNDS doesn’t measure it either. It’s IP-level and covers Outlook.com consumer traffic only.
Its relevance is indirect. SNDS moved address in June 2026 and deprecated the old automated-access URLs, so older monitoring may have quietly stopped working.
Yahoo’s Sender Hub is the third surface, and like the others it reports reputation rather than delivery.
Your Delivery Rate Dropped: What Do You Check First?
Run these in order and stop at the first one that moves. Most drops resolve in the first four.
- Did volume change in the last seven days? Rules out a ramp problem.
- Is the drop on one mailbox or across all of them? Separates a mailbox issue from a domain issue.
- Is it concentrated at one provider? Points at provider-specific enforcement.
- Split hard bounces from soft. Which one moved? Separates list quality from temporary failure.
- Read the bounce codes. A 550 or a 5.7.x is authentication or policy, not list quality. Our free header analyzer will show you the response.
- Do SPF, DKIM and DMARC still resolve? The most common silent cause after a DNS change.
- Check spam rate in Postmaster Tools. Above 0.3% and mitigation is off the table.
- Did a new list or a new domain enter the send in the same window?
If every check passes and replies are still flat, the problem is placement rather than delivery. The deliverability checklist is the better starting point.
How Do You Improve Your Email Delivery Rate?
Clean and verify the list. On delivery rate specifically that’s the highest-leverage move, because invalid addresses are what produce hard bounces.
Authenticate properly. Authentication failures now show up as rejections rather than spam placement, which makes SPF, DKIM and DMARC a direct input here.
Warm new domains and mailboxes before you send at volume, and ramp rather than spike. Email warmup builds the history that stops a new sender being treated as unknown. Our guide to the best email warmup services compares the options.
Frequently Asked Questions
What Is a Good Email Delivery Rate?
For opt-in marketing mail, 98% or higher. For cold email, 95% is a realistic floor, and below that warrants a list audit. Published thresholds range from 89% to 99.5% because they measure different mail.
How Do You Calculate Email Delivery Rate?
Divide delivered by sent and multiply by 100. You can also work it as sent minus bounced, divided by sent, times 100. Both give the same answer. “Sent” means emails attempted, not a filtered subset.
Is Delivery Rate the Same as Deliverability?
No. Delivery rate is one number: what share of your mail a server accepted. Deliverability is the whole discipline of reaching the inbox. You can have excellent delivery and poor deliverability at the same time.
Can a Low Delivery Rate Affect My Domain Reputation?
Yes, because the usual cause is hard bounces, and repeated bounces tell providers your list is unverified. That reputation damage then affects where your accepted mail lands, so a delivery problem becomes a placement problem if you leave it.
What’s the Difference Between a Soft and a Hard Bounce?
A hard bounce is permanent: the address doesn’t exist or the domain doesn’t resolve. A soft bounce is temporary, like a full mailbox. Hard bounces should be suppressed immediately. Repeated soft bounces to the same address should be too.
Does Google Postmaster Tools Show My Delivery Rate?
No. It shows Gmail-side spam rate, authentication results, delivery errors and compliance status, and only for personal Gmail recipients. Your delivery rate lives in your sending platform’s logs.
What’s the Ideal Delivery Rate for Cold Email?
95% or better. Cold sending carries more unverified addresses than opt-in mail, so a lower floor is realistic. Sustained performance below 95% means the list needs auditing, not the sending.
