See where the problem is most likely to sit
Provider filtering, sender reputation, audience quality, authentication, sending pressure and infrastructure are treated as separate possibilities.
Free email deliverability diagnostic
Mailchimp
ActiveCampaign
Klaviyo
HubSpot
Brevo
If You’re Struggling With Low Opens, Clicks & Sales From Your Email Campaigns, This 2-Minute Diagnostic Quiz Will Show You EXACTLY What’s Going Wrong.
Answer a few quick questions about your sending setup, audience and recent results, and we’ll help you fix any issues the diagnostic finds
Start Diagnostic QuizNo email address required
Mailchimp
ActiveCampaign
Klaviyo
HubSpot
Brevo
What the diagnostic gives you
A sensible place to start before you change anything.
The result is not a full technical audit. It uses the information you provide to narrow down the most likely causes and put the next checks in a useful order.
Know what to check first
The result puts the strongest warning signs at the top so you can investigate those before touching parts of the setup that appear healthy.
Avoid broad changes when the problem looks local
If one provider or segment is the obvious outlier, that matters. There is no reason to assume every domain, route or campaign needs rebuilding.
If performance has dropped and the reason is not obvious, use the diagnostic to decide what deserves a closer look.
Start Diagnostic Quiz No email address required
Who it is for
For businesses where email performance matters commercially.
It is designed for ecommerce brands, SaaS companies, memberships, publishers and service businesses sending to a permission-based list that generates sales, leads, bookings, renewals or repeat purchases.
A pattern we see often
Performance drops, but the ESP dashboard still looks normal.
Clicks or sales start slipping, so the obvious suspects get blamed first: the offer, the subject line, the creative or seasonality. Meanwhile, Outlook may have started junking a segment three weeks ago, or an ageing part of the list may be creating the drag.
The useful question is whether the drop comes from the message itself or from the way the sending programme is being treated.
- See whether Gmail, Microsoft, Yahoo or the whole programme looks weakest
- Separate audience and reputation problems from technical faults
- Get a practical order for the next checks instead of changing everything at once
BEFORE
Inbox placementBelow benchmark78%
Spam complaint rateHigh risk0.35%
Open rateBelow average24%
Click rateBelow average1.2%
Email revenueLower return£4.9k
AFTER
Inbox placementExcellent93%
Spam complaint rateExcellent0.03%
Open rateAbove average44%
Click rateAbove average4.2%
Email revenueHigher return£6.3k
Questions about the diagnostic
What it doesand what it does not do
You do not need to connect an account or enter an email address to see the result. The optional guide comes afterwards.
Is this another checklist that tells everyone to fix SPF?
No. The result changes according to your audience, sending behaviour, provider symptoms, recent performance and the public checks we can make reliably. The point is to narrow down the likely cause, not hand every business the same ten tips.
Do I have to give you my email address to see the result?
No. Complete the diagnostic and view your result without entering your name or email address. If you want the Deliverability Academy afterwards, you can choose to have it emailed to you.
Are you going to pitch me before I see my result?
No. Your result comes first. Requesting the Deliverability Academy is optional, and skipping it does not stop you seeing your diagnosis.
My platform says 99% delivered. Can deliverability still be costing me sales?
Yes. “Delivered” usually means the receiving mail system accepted the message. It does not prove that the email reached the primary inbox or that the people most likely to buy actually saw it.
SPF, DKIM and DMARC all pass. Why can revenue still fall?
Authentication proves identity. It does not create demand, repair a weak sender reputation or force Gmail and Microsoft to trust the audience you are sending to. Complaints, list quality, engagement, pacing and provider reputation still matter.
Can one provider really hurt revenue while the rest look normal?
Yes. Gmail, Microsoft, Yahoo and corporate filters make separate decisions. A profitable customer segment can be struggling at one provider while the overall campaign average still looks respectable.
Does this work if I use Klaviyo, Mailchimp, ActiveCampaign or another ESP?
Yes. The diagnostic focuses on the sending signals mailbox providers react to rather than assuming one platform is automatically the problem. Where your platform matters, we ask about it.
How long does it take?
Usually a few minutes. The questions are written in plain English and are designed to get enough signal to be useful without turning the diagnostic into a technical audit form.
Will the diagnostic change anything in my account?
No. It does not edit DNS, change sending routes, pause campaigns or touch your live platform. It identifies the areas most likely to deserve attention so you know what to investigate next.
Is this for cold email or purchased prospect lists?
No. It is built for permission-based email marketing to subscribers, customers, members and other contacts who have a genuine reason to expect your messages.
Start with the likely cause
Find out what deservesa closer look first.
Run the diagnostic, see which warning signs match your situation and use the result as the starting point for a proper investigation.
Start Diagnostic Quiz No email address required