The TL;DR:
Open rates are unreliable now.
iOS privacy. AI prefetching. Bot activity.
Your “opens” are mostly ghosts.
The real operators are tracking metrics that show actual behavior instead of flooding reports with noise.
Here’s what to measure, and how to measure it starting today.
1) Inbox Placement Rate (IPR)
If you’re not landing in the inbox, nothing else matters.
Spam folders destroy engagement.
Even great emails won’t perform if Gmail doesn’t trust you.
How to track it
Use tools like GlockApps, MailGenius, or InboxAlly
Run weekly inbox placement tests across Gmail, Outlook, Yahoo
Aim for 85%+ inbox, <5% spam
Warm your domain + send targeted segments first.
2) Click Quality (Not Click Count)
2025 clicks aren’t about volume, they’re about behavior once an email is opened.
Bots click. Humans engage.
How to track it
Pair your ESP with:
Track:
Time on page
Multi-page visits
Form submissions
Scroll depth
Stop linking to generic pages. Link to intentional, trackable destinations.
3) Time-to-Action (TTA)
The lag between someone opening and acting.
Shorter TTA = sharper copy + cleaner targeting.
How to track it
In ESPs like Klaviyo, ConvertKit, Mailchimp Premium, set up:
“Clicked → Time elapsed” automation triggers
Event timestamps pulled into your CRM
Visualize inside Notion or Google Sheets.
Test your first CTA earlier in the email.
4) Real Read Time
Not “loaded time.” Not “pixel fire.”
Actual reading.
You’ll finally know if humans, not bots, are consuming your content.
How to track it
ESPs that now support real read time:
Campaign Monitor
Sort contacts by: skim (<5 sec), read (5–20 sec), deep read (20+ sec)
Put your strongest insight above the fold.
5) Deliverability Health Score
Your email reputation used to be invisible.
Not anymore.
Your reputation decides inbox vs. spam.
How to track it
Tools: Postmaster Tools, GlockApps, MailboxValidator
Monitor weekly:
Spam complaints
Hard/soft bounces
Authentication issues (SPF, DKIM, DMARC)
Domain reputation changes
Remove unengaged subscribers every 30–45 days.
6) Scroll Depth on Landing Pages
Your email’s job isn’t to convert.
It’s to push the click to the conversion page.
Scroll depth exposes message mismatch.
How to track it
GA4 + Tag Manager scroll events
Or simpler tools like Hotjar, Microsoft Clarity, Fathom
Aim for 60–80% scroll depth on your offer pages
Match your email promise to the landing page headline.
7) Subscriber Retention Velocity
The metric that decides if your email program is sustainable.
Big lists don’t win.
Healthy lists do.
How to track it
Track monthly:
New subs
Unsubs
Net retentionAvg subscriber lifespan
Tools:
ESP dashboards + Notion tracking
Simple retention spreadsheets
Beehiiv’s “lifetime” view
Segment early. Personalize lightly. Don’t batch-blast.