{ "@context": "https://schema.org", "@type": "Article", "headline": "Which transactional email APIs get named by AI assistants", "description": "We measured the 6 third-party pages AI assistants read when someone asks for a transactional email APIs recommendation, and recorded which vendors each one names.", "url": "https://citationfootprint.com/research/transactional-email-apis", "datePublished": "2026-08-16", "dateModified": "2026-08-16", "author": { "@type": "Organization", "name": "Citation Footprint", "url": "https://citationfootprint.com" }, "publisher": { "@type": "Organization", "name": "Citation Footprint" } }
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Citation research

Which transactional email APIs get named by AI assistants

When a buyer asks an assistant to recommend transactional email APIs, it answers from the third-party pages that rank for that question — not from vendor homepages. We fetched all 6 of those pages and recorded every vendor each one names.

Citation share

Postmark
100%
Amazonses
100%
Mailgun
100%
Mailchimp
100%
SendGrid
100%
Mailtrap
83%
Brevo
83%
Resend
67%
Twilio
67%
Mailjet
50%
MailerSend
50%

Share of the 6 sources that name each vendor, by outbound link or by name in the prose. The same test was applied to every vendor. Vendors named in only one source are omitted.

What this shows

Postmark is named in 100% of the pages an assistant would read on this topic.

That spread is not a measure of product quality. It measures which companies are present on the pages that get quoted. Some of the vendors near the bottom are excellent products that simply nobody has written into the comparison articles deciding this category.

The questions we ran

Every source we read

If your company is on this list

The numbers above are yours to use. If you want the detail — every source you appear in with the exact quote, the ranked list of pages naming competitors and not you, and what to do about each — that is what the AI Citation Report contains. $199, delivered in 3 business days, full refund within 14 days if it isn't useful.

If you would rather just fix it yourself using the source list above, please do. That is a completely reasonable outcome and the list is right there.

Method and limits

Pages were fetched one at a time by a crawler identifying itself honestly and respecting robots.txt. On each page we recorded every vendor named, by outbound link and by name in prose, applying the identical test to every vendor. A domain counts as a vendor only if a page gave it its own heading, several pages linked it, or three or more sources named it.

This rests on 6 sources. It is a strong signal about who gets named in this category, not a census of the web. Nobody controls whether an assistant names a given company on a given day, and we do not sell placements.

Citation Footprint · measured 16 August 2026 · hello@citationfootprint.com