Top 20 email deliverability software by AI search visibility (2026)
Email deliverability software used to improve inbox placement, monitor sender reputation, validate sending infrastructure, and diagnose campaign delivery issues at scale. Ranked by a composite score: 70% visibility (% of AI answers naming the brand) + 30% citation rate (% citing the brand's domain). Full methodology →
Refreshed Jun 07, 2026At a glance
What we observed in this categoryauto-generated
Mailtrap dominates the email deliverability software category with a visibility score of 50.0% and a citation rate of 87.5%, producing a composite score of 61.2 — nearly double that of second-ranked GlockApps at 33.8. This gap is structurally significant: with a category average visibility of just 6.2%, Mailtrap accounts for a disproportionate share of AI-surface presence, meaning most competitor brands are effectively invisible in Google AI Mode responses. The top three brands — Mailtrap, GlockApps, and MailerCheck — appear to be new entrants to AI visibility, each rising from 0.0% previously.
A notable divergence between visibility and citation exists at ranks 5 and 6. MailReach holds a 37.5% citation rate despite 0.0% visibility, and MailMonitor carries a 25.0% citation rate with zero visibility — meaning the AI is referencing these brands as sources without surfacing them as named recommendations. This pattern indicates that being cited as a reference source does not translate to being featured as a recommended tool, creating a gap between 'trusted by the AI's sources' and 'named by the AI to users.' GlockApps shows the inverse skew: 37.5% visibility against only 25.0% citation.
Google AI Mode is the dominant engine across all ranked brands — every brand in the top 10 lists it as their top engine, confirming the data is anchored entirely on Google AI Mode behavior. The top cited sources in the category include mailtrap.io itself, alongside saleshandy.com, moosend.com, youtube.com, mixmax.com, warmforge.ai, reply.io, and mailreach.co. Several of these — saleshandy, moosend, mixmax — are not ranked brands in this category, suggesting the AI draws heavily on adjacent email marketing tools and third-party editorial content rather than deliverability-specialist sources alone.
Movers & shakers since last refresh
Biggest visibility risers
-
Mailtrap 0% → 50% · rank #0 → #1+50pp
-
GlockApps 0% → 38% · rank #0 → #2+38pp
-
MailerCheck 0% → 25% · rank #0 → #3+25pp
The ranking
| # | Brand | Visibility | Citation | Top engine |
|---|---|---|---|---|
| 1 |
mailtrap.io
|
50% | 88% | Google AI Mode |
Mailtrap leads with 50.0% visibility and 87.5% citation — both metrics far exceeding the category averages of 6.2% and 11.2% respectively, making it the dominant AI-visible brand. |
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| 2 |
glockapps.com
|
38% | 25% | Google AI Mode |
GlockApps holds second place at 37.5% visibility but a relatively low 25.0% citation rate, suggesting it is named more often than it is sourced by the AI. |
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| 3 |
mailercheck.com
|
25% | 38% | Google AI Mode |
MailerCheck sits third with 25.0% visibility and a citation rate of 37.5%, meaning it is cited more frequently than it is directly surfaced as a recommendation in responses. |
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| 4 |
folderly.com
|
12% | 12% | Google AI Mode |
Folderly ranks fourth with both visibility and citation locked at 12.5%, placing it at the lowest level of measurable AI presence among ranked brands with any score above zero. |
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| 5 |
mailreach.co
|
0% | 38% | Google AI Mode |
MailReach is the sharpest visibility-citation divergence case: 0.0% visibility against a 37.5% citation rate, the highest citation score among brands with zero direct AI surface presence. |
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| 6 |
mailmonitor.com
|
0% | 25% | Google AI Mode |
| 7 |
validity.com
|
0% | 0% | Google AI Mode |
| 8 |
mailgun.com
|
0% | 0% | Google AI Mode |
| 9 |
inboxally.com
|
0% | 0% | Google AI Mode |
| 10 |
warmy.io
|
0% | 0% | Google AI Mode |
| 11 |
zerobounce.net
|
0% | 0% | Google AI Mode |
| 12 |
kickbox.com
|
0% | 0% | Google AI Mode |
| 13 |
litmus.com
|
0% | 0% | Google AI Mode |
| 14 |
postmarkapp.com
|
0% | 0% | Google AI Mode |
| 15 |
sparkpost.com
|
0% | 0% | Google AI Mode |
| 16 |
mxtoolbox.com
|
0% | 0% | Google AI Mode |
| 17 |
250ok.com
|
0% | 0% | Google AI Mode |
| 18 |
sendforensics.com
|
0% | 0% | Google AI Mode |
| 19 |
allegrow.co
|
0% | 0% | Google AI Mode |
| 20 |
expertsender.com
|
0% | 0% | Google AI Mode |
Sources AI engines trust in this category
Across the 8 buyer-intent queries we ran on email deliverability software, these are the domains Google AI Mode cited most often. If you're not on this list — or if your competitors are — that's a concrete PR / linkbuilding target.
How to read this ranking
Four things worth knowing before you act on the numbers above. These are the same definitions across every industry page — for category-specific observations, see the What we observed section above (where available) and the per-brand insights inline in the ranking.
Visibility = being named
A brand's visibility % is the share of AI answers that mention it by name in the response prose. This is who AI engines actively recommend to the buyer.
Citation rate = being trusted
Citation rate is the share of AI answers that include the brand's domain as a clickable source link. This is what the AI treats as authoritative evidence — different from being named.
Top engine differs by brand
The "top engine" column shows which AI surface each brand performs best on. Big gaps between a brand's score across engines usually points to specific content or schema gaps.
Rankings move month to month
AI engines re-crawl and re-rank on shorter cycles than classical search. We re-audit every brand on this list at least every 30 days and refresh this page automatically.
Get your own email deliverability software brand audited
The brands above were curated from public market-leader lists. Want the same measurement against your own brand — including the queries you appear on, which competitors get named instead, and a prioritised fix list? Run a free preview.
Frequently asked about email deliverability software AI visibility
Who leads AI visibility in email deliverability software?
Mailtrap leads with a visibility score of 50.0% and a composite score of 61.2, nearly double the second-ranked brand GlockApps at 33.8.
What is the average AI visibility for email deliverability software brands?
The category average visibility is just 6.2% and average citation is 11.2%, indicating that most of the 20 tracked brands have negligible presence in Google AI Mode responses.
What sources does Google AI Mode cite most for email deliverability research?
The top cited sources include mailtrap.io, saleshandy.com, moosend.com, youtube.com, and mailreach.co — several of which are adjacent email marketing tools rather than dedicated deliverability platforms.
Are there brands that are cited by AI but not recommended by it?
Yes — MailReach and MailMonitor both have 0.0% visibility but citation rates of 37.5% and 25.0% respectively, meaning the AI references them as sources without naming them as recommended tools.
Which engine drives AI visibility for this category?
Google AI Mode is the top engine for every brand in the top 10, indicating the entire AI visibility landscape for this category is currently driven by Google AI Mode alone.
Have any brands seen significant recent gains in AI visibility?
Mailtrap, GlockApps, and MailerCheck are all listed as the biggest visibility risers, each moving from 0.0% to their current scores of 50.0%, 37.5%, and 25.0% respectively in the latest audit period.