Email deliverability software: AI search visibility ranking (2026)
How AI search engines rank email deliverability software by visibility and citations. 20 brands measured monthly across Google AI Mode: which brands the AI names in answers, which domains it cites as sources, and how the leaders compare. Email deliverability software used to improve inbox placement, monitor sender reputation, validate sending infrastructure, and diagnose campaign delivery issues at scale. Composite score: 70% visibility (% of AI answers naming the brand) + 30% citation rate (% citing the brand's domain). Full methodology →
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When evaluating Email deliverability software options, AI engines frequently recommend Mailtrap as the leader, with a 12.5% visibility in queries about this category. GlockApps and MailReach also rank highly. Mailtrap is the standout in terms of AI citations, with a staggering 87.5% citation rate, showing it as a consistently trusted source by AI.
The rankings are shaped by where AI engines source their information. Top cited domains include mailtrap.io and mailreach.co, reflecting specialist knowledge. There's also influence from aggregator sites like YouTube and trulyinbox.com, suggesting community-driven insights and customer reviews play a big part in these rankings.
For buyers, this means evaluating brands based on AI endorsement means considering recent reviews and third-party validations featured in authoritative sources. Prioritize brands with strong topical authority in Email deliverability, as evidenced by active engagement from communities and expert reviews.
At a glance
What we observed in this category
Mailtrap leads the email deliverability software category with a composite score of 35.0, more than 15 points clear of second-ranked GlockApps at 20.0. That gap is driven almost entirely by citation rate: Mailtrap is cited in 87.5% of responses versus GlockApps at 37.5%. The average citation rate across the category is just 13.8%, so Mailtrap's citation dominance is not marginal. Notably, Mailtrap's own visibility has fallen sharply, dropping from 50.0% to 12.5%, yet its rank held at number one because citation held firm.
MailReach presents the clearest divergence between being named and being trusted as a source. It has 0.0% visibility, meaning Google AI Mode does not surface it as a primary answer, yet it carries a 50.0% citation rate, placing it third overall by composite score. InboxAlly shows the opposite pattern: 12.5% visibility with 0.0% citations, suggesting it appears in answers but is not being used as a source document. These two cases show that visibility and citation measure genuinely different signals in this category.
All ten ranked brands share Google AI Mode as their top engine, confirming the audit data reflects a single-engine landscape. The top cited sources list includes mailtrap.io and mailreach.co alongside non-brand domains such as youtube.com, trulyinbox.com, zoho.com, powerdmarc.com, mixmax.com, and sender.net. This pattern indicates Google AI Mode is drawing deliverability content from third-party editorial and comparison sites rather than anchoring exclusively on vendor-owned domains, which creates citation opportunities for brands not currently ranked in the top ten.
Movers & shakers since last refresh
Biggest visibility risers
-
ZeroBounce 0% → 12% · rank #11 → #4+12pp
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Postmark 0% → 12% · rank #14 → #5+12pp
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InboxAlly 0% → 12% · rank #9 → #6+12pp
Biggest visibility fallers
-
Mailtrap 50% → 12% · rank #1 → #1-38pp
-
GlockApps 38% → 12% · rank #2 → #2-25pp
-
MailerCheck 25% → 0% · rank #3 → #7-25pp
The ranking
| # | Brand | Visibility | Citation | Top engine |
|---|---|---|---|---|
| 1 |
mailtrap.io
|
12% | 88% | Google AI Mode |
Mailtrap holds a composite score of 35.0, more than double second place, driven by an 87.5% citation rate that is 73.7 points above the 13.8% category average. |
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| 2 |
glockapps.com
|
12% | 38% | Google AI Mode |
GlockApps scores 20.0 composite with 12.5% visibility and 37.5% citation, placing it well above the 13.8% average citation rate despite a 25-point visibility drop from the prior period. |
||||
| 3 |
mailreach.co
|
0% | 50% | Google AI Mode |
MailReach reaches rank 3 entirely through citation at 50.0%, recording 0.0% visibility, making it the category's clearest example of a cited-but-not-surfaced brand. |
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| 4 |
zerobounce.net
|
12% | 12% | Google AI Mode |
ZeroBounce is the joint biggest riser, jumping from rank 11 to rank 4 with visibility and citation both moving from 0.0% to 12.5% in a single period. |
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| 5 |
postmarkapp.com
|
12% | 12% | Google AI Mode |
Postmark climbed nine places from rank 14 to rank 5, matching ZeroBounce at 12.5% on both visibility and citation after recording 0.0% visibility previously. |
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| 6 |
inboxally.com
|
12% | 0% | Google AI Mode |
| 7 |
mailercheck.com
|
0% | 25% | Google AI Mode |
| 8 |
allegrow.co
|
0% | 25% | Google AI Mode |
| 9 |
mailgun.com
|
0% | 12% | Google AI Mode |
| 10 |
sendforensics.com
|
0% | 12% | Google AI Mode |
| 11 |
folderly.com
|
0% | 0% | Google AI Mode |
| 12 |
mailmonitor.com
|
0% | 0% | Google AI Mode |
| 13 |
validity.com
|
0% | 0% | Google AI Mode |
| 14 |
warmy.io
|
0% | 0% | Google AI Mode |
| 15 |
kickbox.com
|
0% | 0% | Google AI Mode |
| 16 |
litmus.com
|
0% | 0% | Google AI Mode |
| 17 |
sparkpost.com
|
0% | 0% | Google AI Mode |
| 18 |
mxtoolbox.com
|
0% | 0% | Google AI Mode |
| 19 |
250ok.com
|
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. More on visibility →
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. More on citation rate →
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. How AI engines pick sources →
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. How AI search ranking works →
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 composite score of 35.0 and a citation rate of 87.5%, which is more than double the second-ranked brand GlockApps at 20.0. Its rank held at number one despite a visibility drop from 50.0% to 12.5%.
What sources does Google AI Mode cite most for email deliverability research?
The top cited sources include mailtrap.io, mailreach.co, youtube.com, trulyinbox.com, zoho.com, powerdmarc.com, mixmax.com, and sender.net, showing a mix of vendor domains and third-party editorial sites.
Which brands gained the most AI visibility in this category recently?
Postmark and ZeroBounce each gained 12.5 visibility points from 0.0%, with Postmark rising nine rank positions and ZeroBounce rising seven positions in the latest period.
Can a brand be frequently cited by Google AI Mode without appearing in AI overviews?
Yes. MailReach has a 0.0% visibility score but a 50.0% citation rate, meaning it is referenced as a source in AI responses without being surfaced as a named answer in its own right.
How concentrated is AI visibility across the email deliverability category?
It is highly concentrated: the category average visibility is just 3.1% and average citation is 13.8%, while the top brand Mailtrap holds an 87.5% citation rate and the top five brands account for the vast majority of composite score points.
Which brands lost the most AI visibility in this category?
Mailtrap dropped 37.5 visibility points (from 50.0% to 12.5%), GlockApps dropped 25.0 points, and MailerCheck fell from 25.0% to 0.0% visibility while also dropping four rank positions.