Stunning Email Deliverability:
An Honest Assessment
A recovery email that lands in spam is a recovery that never happens. This review covers how Stunning handles email deliverability, where the gaps are, and what you can do regardless of which dunning tool you use.
Why it matters
What email deliverability means for dunning
Dunning email deliverability is not an abstract technical concern. It has a direct and measurable impact on how much subscription revenue you recover each month.
~9%
of MRR lost to failed payments monthly
At $30,000 MRR, that is $2,700 disappearing every month. Email deliverability determines how much of it you get back.
0%
recovery rate if the email lands in spam
A customer who never sees the recovery email cannot update their card. Deliverability is the precondition for everything else.
57%
of failed payments can be recovered
With properly delivered, well-timed sequences. The email has to reach the inbox first.
Stunning's approach
How Stunning handles deliverability
Stunning has been in the Stripe dunning space long enough to build a competent deliverability setup. Here is what their infrastructure includes.
Stunning does not rely on a generic email provider for dunning sends. They manage their own sending infrastructure with IPs that have been warmed specifically for dunning sequences. This means better baseline reputation than tools that simply relay through a shared transactional provider.
Shared IP pools used by Stunning are gradually warmed over time, meaning sending reputation builds incrementally rather than starting cold. For accounts that send reasonable volumes, this infrastructure provides adequate inbox placement for most recipients.
On higher-tier Stunning plans, you can authenticate a custom sending domain with SPF and DKIM records. This allows recovery emails to be sent from your own domain, improving trust signals for receiving mail servers and open rates with recipients who recognize your brand.
Stunning allows you to configure the from-name and from-address for your dunning emails. Personalizing these fields so emails appear to come from a real person at your company, rather than a generic dunning address, meaningfully improves open rates.
Where gaps exist
Common deliverability concerns with Stunning
These are not fatal flaws. They are trade-offs that are worth understanding before you evaluate whether Stunning is the right fit for your situation.
Shared IP reputation risk at entry tier
On entry-tier plans, your dunning emails share IP reputation with other Stunning customers. If another account on the same pool has high spam complaint rates, it can temporarily affect your inbox placement. This risk is manageable but real. Moving to a plan with custom domain authentication mitigates it significantly.
Custom domain gated to higher plans
The most impactful deliverability improvement, sending from your own authenticated domain, is only available on Stunning's higher-tier plans. Customers on entry-level plans send from Stunning's domain rather than their own. For businesses where brand recognition in the inbox matters, this is a meaningful constraint.
No dedicated deliverability team
Unlike Churn Buster, which has built deliverability expertise over a decade as a core product differentiator, Stunning does not emphasize a dedicated deliverability team as part of their offering. For most SaaS companies, this does not matter much. For high-volume operations where inbox placement directly determines recovery rates at scale, it is worth noting.
Universal best practices
How to maximize deliverability with any dunning tool
The dunning tool you choose matters less than these four practices. Apply them regardless of whether you use Stunning, SubRevival, or anyone else.
Use a custom sending domain with SPF/DKIM
This is the single highest-impact action. Authenticate a sending domain you own, add the SPF and DKIM records your dunning tool provides, and your emails immediately carry stronger trust signals with receiving mail servers. Open rates typically improve as well because recipients recognize your brand in the from-address.
Warm your sending domain gradually
If you are starting with a new sending domain, do not send your full dunning volume on day one. Start with a smaller batch and ramp up over two to four weeks. ISPs look at sudden volume spikes from new domains as a spam signal. Gradual warm-up builds reputation before you need it.
Avoid spam trigger words in subject lines
Subject lines with words like "urgent", "final notice", "payment required", or anything in all-caps are more likely to be filtered by spam engines. Write subject lines the way a colleague would: clear, direct, and personal. "Quick question about your account" consistently outperforms "PAYMENT FAILED: Action Required".
Send short, plain-text emails
Heavily formatted HTML emails with images, logos, and multiple CTAs trigger spam filters more often than simple plain-text or minimally formatted messages. The best-performing dunning emails look like messages from a real person, not a marketing campaign. Short, clear, and to the point.
SubRevival's approach
How SubRevival handles deliverability
SubRevival uses the same category of managed sending infrastructure as Stunning, with custom domain authentication available at a lower plan tier.
Managed infrastructure, shared IPs
On Starter, emails are sent from SubRevival's managed sending infrastructure using shared, warmed IPs. This provides adequate deliverability for most early-stage businesses. From-name and from-address are fully customizable so emails appear to come from your team.
Custom sending domain with SPF/DKIM
On Growth and Pro, you can authenticate your own custom sending domain with SPF and DKIM records. Every recovery email then arrives from your brand address on your own domain, with full authentication signals. This is the same deliverability setup used by well-configured transactional email providers.
Dunning emails that actually reach the inbox.
SubRevival's Growth plan includes custom domain authentication with SPF/DKIM from $49/mo. Connect via Stripe OAuth in 5 minutes.
Side by side
Stunning vs SubRevival: deliverability features
Based on publicly available information as of June 2026. Verify Stunning's current features at stunning.co.
Both tools provide adequate deliverability for most SaaS businesses. The biggest gains come from authenticating your own sending domain, which SubRevival unlocks at $49/mo.
Common questions
Stunning email deliverability FAQ
Does Stunning use shared or dedicated IPs?
On entry-tier plans, Stunning uses a shared IP pool. Your email sender reputation is partially tied to the behavior of other senders on the same infrastructure. Dedicated IPs are typically reserved for higher-tier plans or enterprise accounts. Check stunning.co for the most current plan details.
Can I send dunning emails from my own domain with Stunning?
Custom sending domain support with SPF/DKIM authentication is gated to higher-tier Stunning plans. On entry-tier plans, emails are sent from Stunning's domain, which means recipients see a sending address that does not match your brand. This can reduce open rates and increase spam classification risk compared to emails sent from your own authenticated domain.
What affects dunning email deliverability the most?
Four factors matter most: using your own authenticated sending domain (SPF/DKIM), keeping your sending volume consistent and gradually warmed up, avoiding spam trigger words in subject lines and body copy, and writing short plain-text emails rather than heavily formatted HTML. Domain authentication is the single highest-impact change most SaaS teams can make.
Does SubRevival have good email deliverability?
SubRevival uses managed sending infrastructure with warmed shared IPs on the Starter plan. On Growth ($49/mo) and Pro ($149/mo), you can authenticate your own custom sending domain with SPF and DKIM, so every recovery email arrives from your brand address on your own domain. This is the same deliverability setup used by high-performing transactional email tools.
Which dunning tool has the best deliverability?
Churn Buster is widely considered to have the deepest deliverability expertise in the category, with over a decade of high-volume sending and dedicated infrastructure refinement. For most SaaS companies under $100K MRR, however, the deliverability gap between Churn Buster, Stunning, and SubRevival is small, and the biggest wins come from your own domain authentication and email copy quality, not the tool itself.
Related pages
Recovery emails that reach the inbox, from your own domain.
SubRevival's Growth plan includes custom sending domain authentication with SPF/DKIM. Start at $19/mo and upgrade when you need it.