AEO for email delivery services: AI search visibility ranking
How AI search engines rank email delivery services 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 delivery services used by product, marketing, and engineering teams to send transactional and bulk email with APIs, SMTP infrastructure, analytics, and deliverability tooling. Composite score: 70% visibility (% of AI answers naming the brand) + 30% citation rate (% citing the brand's domain). Full methodology →
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Buyers often turn to AI when evaluating email delivery services, and MailerSend emerges as a clear leader. With 12.5% visibility among AI answers and cited in 50% of responses, it stands out prominently. Other noteworthy brands like SMTP.com and Postmark are mentioned, but MailerSend clearly leads the pack.
AI rankings are heavily influenced by online sources, mainly aggregator and review sites like youtube.com, reddit.com, and zapier.com, as well as direct sources such as smtp.com and sequenzy.com. These domains provide the data AI engines rely on, giving prominence to brands frequently mentioned or well-reviewed on these platforms.
For buyers evaluating this list, consider the significance of recent reviews and third-party validation. AI engines prioritize topical authority, favoring brands with consistent and positive feedback across multiple credible sources. This suggests that staying informed through updated reviews and expert opinions can be crucial when choosing the right email delivery service.
At a glance
What we observed in this category
MailerSend leads the email delivery services category with a composite score of 23.8, ahead of SMTP.com at 22.5 and Postmark at 16.2. The gap between the top two and the rest is significant: Amazon SES, a well-known infrastructure brand, scores only 12.5, and brands ranked 7 through 10 cluster at 3.8. MailerSend is also the biggest riser in the dataset, jumping from rank 9 to rank 1 with a visibility delta of 12.5 and a citation delta of 37.5, suggesting a rapid shift in AI preference.
The most striking divergence between visibility and citation sits with SMTP.com, which holds a 75.0 citation rate despite 0.0 visibility. Mailtrap shows the same pattern: cited 50.0 percent of the time but appearing in zero visibility queries. This means these brands are referenced as trusted sources in AI answers but are not being surfaced as named recommendations in response to direct queries. Brevo inverts this, showing 12.5 visibility with 0.0 citations, indicating it is named but not backed by cited sources in AI responses.
All top brands share Google AI Mode as their primary engine, confirming this category's AI visibility is concentrated in one channel. The top cited sources include youtube.com, reddit.com, and zapier.com alongside brand-owned domains like smtp.com, mailtrap.io, and mailersend.com. The presence of instantly.ai and sequenzy.com in the source list suggests AI is drawing on niche third-party review and tutorial content rather than major review platforms alone. Mailgun's fall from rank 1 to rank 16 with a citation delta of -25.0 reinforces how quickly AI source preferences shift.
Movers & shakers since last refresh
Biggest visibility risers
-
MailerSend 0% → 12% · rank #9 → #1+12pp
Biggest visibility fallers
-
Mailgun 12% → 0% · rank #1 → #16-12pp
The AEO ranking
| # | Brand | Visibility | Citation | Top engine |
|---|---|---|---|---|
| 1 |
mailersend.com
|
12% | 50% | Google AI Mode |
MailerSend leads with a composite score of 23.8 and a citation rate of 50.0 percent, five times the category average of 14.4 percent, after rising eight places from rank 9. |
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| 2 |
smtp.com
|
0% | 75% | Google AI Mode |
SMTP.com holds the highest citation rate in the dataset at 75.0 percent despite 0.0 visibility, meaning AI cites its domain as a source but rarely names it as a direct recommendation. |
||||
| 3 |
postmarkapp.com
|
12% | 25% | Google AI Mode |
Postmark scores 16.2 composite with balanced metrics of 12.5 visibility and 25.0 citation, placing it closer to MailerSend than to Amazon SES despite lower name recognition signals. |
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| 4 |
mailtrap.io
|
0% | 50% | Google AI Mode |
Mailtrap matches MailerSend's 50.0 percent citation rate but records 0.0 visibility, suggesting AI trusts its content as a reference source without surfacing it in recommendation-style responses. |
||||
| 5 |
aws.amazon.com
|
12% | 12% | Google AI Mode |
Amazon SES sits at rank 5 with a composite score of 12.5 and a citation rate of 12.5 percent, below the category average citation rate of 14.4 percent despite its infrastructure dominance. |
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| 6 |
brevo.com
|
12% | 0% | Google AI Mode |
| 7 |
socketlabs.com
|
0% | 12% | Google AI Mode |
| 8 |
elasticemail.com
|
0% | 12% | Google AI Mode |
| 9 |
bird.com
|
0% | 12% | Google AI Mode |
| 10 |
bird.com
|
0% | 12% | Google AI Mode |
| 11 |
netcorecloud.com
|
0% | 12% | Google AI Mode |
| 12 |
bird.com
|
0% | 12% | Google AI Mode |
| 13 |
mailjet.com
|
0% | 0% | Google AI Mode |
| 14 |
resend.com
|
0% | 0% | Google AI Mode |
| 15 |
pepipost.com
|
0% | 0% | Google AI Mode |
| 16 |
mailgun.com
|
0% | 0% | Google AI Mode |
| 17 |
sendgrid.com
|
0% | 0% | Google AI Mode |
| 18 |
courier.com
|
0% | 0% | Google AI Mode |
| 19 |
mailchimp.com
|
0% | 0% | Google AI Mode |
| 20 |
smtp2go.com
|
0% | 0% | Google AI Mode |
Sources AI engines trust in this category
Across the 8 buyer-intent queries we ran on email delivery services, 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 AEO 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 →
AEO 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 →
Run an AEO audit on your own email delivery services brand
The brands above were curated from public market-leader lists. Want the same answer engine optimisation 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 AEO for email delivery services
Who leads AI visibility in email delivery services?
MailerSend leads with a composite score of 23.8 and a citation rate of 50.0 percent, ahead of SMTP.com at 22.5 and Postmark at 16.2.
Which brand has the highest citation rate in this category?
SMTP.com holds the highest citation rate at 75.0 percent, yet records 0.0 visibility, indicating AI uses its domain as a source reference rather than a named recommendation.
What sources does AI cite most for email delivery services research?
The top cited sources include youtube.com, reddit.com, zapier.com, and brand-owned domains such as smtp.com, mailtrap.io, and mailersend.com, alongside niche sites instantly.ai and sequenzy.com.
Which brand has seen the biggest drop in AI visibility recently?
Mailgun fell from rank 1 to rank 16, losing 12.5 points of visibility and 25.0 points of citation, the largest single-brand decline in the dataset.
Is AI visibility in this category spread across multiple engines?
No. Every brand in the top 10 lists Google AI Mode as its top engine, meaning category visibility is almost entirely concentrated in one channel.
How does Amazon SES perform in AI visibility compared to smaller specialist brands?
Amazon SES scores 12.5 composite with a 12.5 percent citation rate, below the category average of 14.4 percent and well behind specialist brands like MailerSend and Mailtrap.