If you do influencer outreach, you'll eventually become a bit of an email marketer too. Once you start sending to hundreds of creators, you can't judge a campaign by gut feeling. You need numbers.
I've been running influencer campaigns since 2013, and for the last two years I've spent much of my time on high-volume cold outreach. Over that time, I've settled on five metrics I check after every send: reply rate, acceptance rate, open rate, bounce rate and spam rate.
Here's what each one measures, how to calculate it, what a good number looks like, and what to fix when it drops. Spoiler: the metric most people watch first is the one I trust least.
If you're just starting, first read how to contact influencers, then come back to measure the results.
The 5 influencer outreach metrics at a glance
The five influencer outreach metrics worth tracking are reply rate, acceptance rate, open rate, bounce rate and spam rate. I calculate all five against the number of emails sent, so they're easy to compare with each other and across campaigns.
Metric | What it shows | Formula | My benchmark |
Reply rate | Whether your email is relevant and clear enough to start a conversation | Replies ÷ sent emails × 100 | 6–15% for bulk sends, 20–30% for well-personalized emails |
Acceptance rate | How many cold contacts turn into creators ready to work with you | Emails that got a "yes" ÷ sent emails × 100 | Compare across campaigns, there's no universal benchmark |
Open rate | Whether your email reached the inbox and the subject line worked | Opened emails ÷ sent emails × 100 | 20% is fine, 10% means something's wrong, 50–60% is what I aim for |
Bounce rate | How clean your email list is | Bounced emails ÷ sent emails × 100 | Around 2%, alarm above 5% |
Spam rate | Your sender reputation | Emails marked as spam ÷ sent emails × 100 | Ideally 0% |
The order isn't random. The first two tell you whether outreach works. The last three tell you why it doesn't.
1. Reply rate: the one metric I'd keep
Reply rate is the percentage of outreach emails that got a reply. If I could track only one metric, it would be this one. It's the most reliable signal of whether your message is relevant, clear and interesting enough to start a conversation.
Formula: reply rate = replies ÷ sent emails × 100
Example: you email 300 creators and 42 reply. Your reply rate is 42 ÷ 300 × 100 = 14%.
What's a good reply rate?
It depends on who you're emailing:
Who you email | Typical reply rate |
Mega-influencers | 1% already counts as a success |
A creator list, bulk send | 6–15% |
A creator list, well-personalized emails | 20%, sometimes close to 30% |
These ranges come from my own campaigns. Your numbers will depend on your niche, your brand and, above all, your offer.
To move from the bulk range toward 20–30%, rework the email itself: here's the influencer outreach email template I recommend.
What counts as a reply?
I count every reply: a yes, a question, a "no, thanks" and even an auto-reply. That's why reply rate alone doesn't tell you whether the replies are any good. For that, you need the next metric.
2. Acceptance rate: how many creators say yes
Acceptance rate, also called positive reply rate, is the percentage of outreach emails that end in a confirmed "yes" from the creator. It shows how well your outreach turns cold contacts into creators ready to collaborate, and it's the best measure of how relevant your offer is.
Formula: acceptance rate = emails that got a "yes" ÷ sent emails × 100
Example: of 300 creators, 42 reply and 18 of them agree to work with you. Your acceptance rate is 18 ÷ 300 × 100 = 6%.
What counts as a "yes"?
I count a "yes" the moment the creator agrees in the email thread. Everything after that, from rates to deadlines to a signed contract, is the result of negotiation. That's a different stage with its own metrics.
Why track it next to reply rate?
Because a high reply rate can hide a weak offer. If many creators reply but few say yes, your email gets attention, but the deal doesn't work for them. Look at the offer itself: the compensation, what you ask them to publish and how well it fits their content.
There's no universal benchmark for acceptance rate. It depends too much on the type of collaboration: a free product, an affiliate commission and a paid post get very different answers. Compare it across your own campaigns instead.
3. Open rate: a direction, not a KPI
Open rate is the percentage of outreach emails that were opened. It's your first signal of whether the email reached the inbox and whether the subject line worked. It's also the metric I trust least.
Formula: open rate = opened emails ÷ sent emails × 100
What's a good open rate for influencer outreach?
20% is normal. A bit lower is still acceptable.
10% means something is wrong with deliverability or the subject line.
50–60% is what I aim for in my own campaigns.
Why I don't treat open rate as a KPI
The most common advice I disagree with is "watch your open rate." Today, most emails are scanned by bots before a person ever sees them. Security filters and privacy features such as Apple Mail Privacy Protection open the email automatically, so open rates, and even click rates, come out inflated.
That's why I use open rate only as a direction. It's useful for diagnosing problems, as you'll see below, but it can't tell you whether your outreach works. Reply rate can.
At high volumes, I switch open tracking off altogether, and I explain why in my guide to AI influencer outreach with HypeAgent.
What affects open rate?
Two things: deliverability, the technical side of whether your email reaches the inbox at all, and the subject line.
4. Bounce rate: how clean your list is
Bounce rate is the percentage of outreach emails that never reached the recipient, usually because the address doesn't exist. A high bounce rate almost always means poor data quality.
Formula: bounce rate = bounced emails ÷ sent emails × 100
What's a good bounce rate?
A good email bounce rate for outreach is around 2%. Above 5%, there's a real chance your next emails start landing in spam: to email providers, a list where 1 in 20 addresses doesn't exist looks like a spammer's list.
How to keep it low
Verify your list. For sends of more than 1,000 addresses, run the list through an email verification service first. Which verification service I use, and when you need one at all, is in my breakdown of the influencer outreach tools I rely on for high-volume sends.
Send in batches. Split a large list randomly into batches of 100 to 200 addresses and send them one by one.
Check the first batch. If 10% or more of it bounces, stop and clean the list before you send the rest.
5. Spam rate: your sender reputation
Spam rate is the percentage of your emails that recipients mark as spam. It reflects your sender reputation, the quality of your emails and your sending patterns, and it's the metric that can shut down your outreach the fastest.
Formula: spam rate = emails marked as spam ÷ sent emails × 100
How to measure spam rate
You can't see which emails landed in spam folders, so you need a proxy. I use Google Postmaster Tools: it shows the user-reported spam rate for your domain, along with your domain reputation. Connect your domain before your first large send.
What's a good spam rate?
Ideally, 0%. Google is strict here: its guidance for senders is to keep the spam rate in Postmaster Tools below 0.1% and never let it reach 0.3%. Above 0.3%, Gmail treats it as a policy violation.
If your spam rate starts climbing, pause your sends and find the cause before your domain's reputation drops. Usually it's one of three things: a list that's too cold, a generic email that recipients don't understand, or a sudden jump in volume from a mailbox that hasn't been warmed up.
How to read outreach metrics together
One metric on its own rarely tells you what's wrong. Combinations do. Here are the three patterns I see most often and what each one means:
What you see | What it means | What to do |
High open rate, low reply rate | Your mailbox has a good reputation and the subject line works. The offer doesn't. | Rework the offer: compensation, deliverables, fit with the creator's content |
Low open rate, good deliverability (low bounce and spam rates) | Emails reach the inbox, but the subject line doesn't get them opened | Rewrite the subject line |
Low open rate, poor deliverability (high bounce rate) | Your list has many addresses that don't exist | Clean and verify the list. If it keeps happening, check Google Postmaster Tools for reputation problems with your mailbox or domain |
Notice that open rate is useful here not as a score, but as a clue. Paired with reply and bounce rates, it tells you where to look.
When to check your outreach metrics
Check your metrics four times after each send: a few hours after it goes out, the next day, after 3 days and after 7 days. Within 7 days, all five metrics usually stabilize and barely change after that.
A few hours after sending: look at bounce rate. Bounces come back fast, and a high number is a reason to stop the rest of the send.
The next day: look at open rate and the first replies. This is where a weak subject line shows up.
After 3 days: most replies are in. Look at reply rate and acceptance rate.
After 7 days: the numbers are final. Compare them with your previous campaigns and decide what to change next time.
How to track outreach metrics in HypeAuditor
If you send outreach from HypeAuditor, you don't need a spreadsheet for these numbers. Every bulk send gets its own report on the Broadcasts tab, with sent, delivered, opened, replied and not delivered emails, each as a count and a share of all emails sent.
In the example above, the numbers read like this:
Reply rate of 14%: right in the 6–15% range for a bulk send. To push it toward 20–30%, personalize more.
Open rate of 47%: close to my 50–60% target, so deliverability and the subject line are fine.
Bounce rate of 2%: exactly where it should be. The list is clean.
Below the overview, you can filter recipients by status and open the replies, which is how you count acceptance rate. For spam rate, use Google Postmaster Tools.
To set up the sends themselves, from templates and personalization to automated follow-ups, see How to Run Influencer Outreach in HypeAuditor.
FAQ
What metrics should you track for influencer outreach?
Track five influencer outreach metrics: reply rate, acceptance rate, open rate, bounce rate and spam rate. Reply and acceptance rates show whether your outreach works. Open, bounce and spam rates help you find out why it doesn't.
What is the most important influencer outreach metric?
Reply rate is the most important influencer outreach metric. It shows whether creators find your email relevant enough to answer, and unlike open rate, it isn't inflated by bots and privacy features.
What is a good reply rate for influencer outreach?
A good reply rate for influencer outreach is 6% to 15% for bulk sends and 20% to 30% for well-personalized emails. For mega-influencers, even 1% counts as a success.
What is a good open rate for cold outreach emails?
An open rate of around 20% is normal for cold outreach to creators, 10% signals a problem, and 50% to 60% is a strong result. Treat open rate as a direction only: bots and Apple Mail Privacy Protection inflate it.
What is positive reply rate?
Positive reply rate, or acceptance rate, is the percentage of outreach emails that end in a "yes" from the creator. It shows how relevant and attractive your offer is, while the overall reply rate also counts questions, refusals and auto-replies.
What is a good bounce rate for outreach emails?
A good bounce rate for outreach emails is around 2%. Above 5%, your emails are at real risk of landing in spam, so verify the list before you send more.
What spam rate is acceptable?
Aim for a spam rate of 0%. Google recommends keeping the spam rate in Postmaster Tools below 0.1% and never letting it reach 0.3%.
How long should you wait before evaluating an outreach campaign?
Wait 7 days. Within a week of sending, outreach metrics usually stabilize and barely change after that.
Sources
Email sender guidelines, Google Workspace Admin Help
