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Transactional Email

MailerSend

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Panel rating · 6 judges · How to read the stars

Category median

Sovereignty: not determined

0–5 in half steps. 5 means the rubric's top anchor is met on the evidence.

by MailerSend, Inc. · www.mailersend.com

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MailerSend at a glance

Vendor
MailerSend, Inc.
Headquarters
Not stated on the vendor’s pages as of 1 Nov 2026
Data hosting
Default not stated; pages mention Belgium source, captured 1 Nov 2026
Free plan
Yes, per the vendor’s own page source, captured 1 Nov 2026
Starting price
“upgrade for as little as $7 when you need more emails and features.” (vendor’s words) source, captured 1 Nov 2026
Panel verdict
The AI panel rates MailerSend 2.5/5, the mean of 6 judges. MailerSend's evidence is strongest for developers: sending API and observability scores cluster at 7, on seven official SDKs, a published OpenAPI spec, a CLI, an SMTP relay with documented limits, a searchable per-message log with HTML, plain-text and raw views, and signed webhooks retried twice on a published schedule. how scores are made
As of
Vendor pages captured 1 Nov 2026; evaluated by the panel 1 Nov 2026. all sources

MailerSend alternatives, European ones first →

Read this page as one judge. Each weighs the same scores by what they care about.

The Data Protection Officer

Weighted verdict

In-house data protection officer at a health software company whose appointment reminders and lab-result notices carry patients' names. Treats the sending service as a processor like any other. Reads the DPA, the subprocessor list and the retention section first: whether message bodies are stored and for how long, whether open tracking can be turned off, which entity signs, and whether the EU region covers the logs as well as the mail.

Same scores as the panel view — this lens weights them the way this judge cares.

Scored by The Data Protection Officer

Panel median The Data Protection Officer This judge’s scores over the panel median. Each label opens its reasoning below.
Scores per criterion, in stars out of 5
Criterion Panel median The Data Protection Officer
Sending API, SMTP & developer experience 3.5 of 5 3.5 of 5
Deliverability & sender reputation 3 of 5 3 of 5
Message logs, events & webhooks 3.5 of 5 3.5 of 5
Message data, retention & security 3 of 5 3 of 5
Reliability, accounts & support 3 of 5 3 of 5
European sovereignty 2.5 of 5 2.5 of 5
Pricing transparency 3.5 of 5 3.5 of 5

Sending API, SMTP & developer experience

How this is scored

How an application sends mail: a REST API and an SMTP relay with their limits stated, official SDKs and drivers for named languages and frameworks (PHP and Laravel, Node, Python, Ruby and Rails, Java, Go, .NET), stored templates with variables and versions, batch sending, attachments, idempotency keys, scheduled sending, a test or sandbox mode that does not deliver, inbound email parsed into a webhook, and the quality of the API reference and guides.

0 — Not a sending service; an application cannot send email through it by API or SMTP.

3 — An API or SMTP credentials to send a message; SDKs, templates, limits and a test mode are basic or not described.

5 — A documented REST API and SMTP relay, official SDKs for several named languages, stored templates with variables, attachments and batch sending, rate limits stated, a sandbox or test mode, and quick-start guides for named frameworks.

8 — An API reference with every endpoint and error code, idempotency keys, scheduled sending, template versions and a template language documented, inbound email parsed to a webhook, an OpenAPI specification or official CLI, framework drivers maintained by the vendor, and a migration guide from named competitors.

10 — An API a team builds its product on: versioning and deprecation policy published, backward compatibility stated, full parity between API and SMTP features, local or staging test tooling that mirrors production, and every limit, timeout and retry behaviour documented.

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The Data Protection Officer

The developer story is well documented: a RESTful API with a published OpenAPI specification on SwaggerHub, an official CLI, and official SDKs for PHP, Laravel, Node.js, Python, Go, Ruby and Java; SMTP relay limits are unusually explicit (five messages per connection, IP-based rate limits below the API's, TLS on port 587 only, custom headers dropped), inbound routing delivers parsed mail to webhooks, and a sandbox domain with a 14-day Professional trial needs no credit card. We found no public information on idempotency keys, template versioning or migration guides from named competitors. 2 6 13 14

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Deliverability & sender reputation

How this is scored

What the vendor does so the mail reaches the inbox: guided SPF, DKIM and DMARC set-up with a custom return path and tracking domain, shared IP pools and how senders on them are vetted and policed, dedicated IPs with automatic warm-up, transactional and bulk mail kept on separate streams or IP pools, bounces, complaints and unsubscribes turned into suppressions automatically, feedback loops with mailbox providers, blocklist and DMARC monitoring, compliance with the Gmail and Yahoo bulk-sender rules, and published delivery times or inbox placement with their method.

0 — No sender authentication and no bounce handling; mail goes out from shared addresses with no reputation management at all.

3 — SPF and DKIM can be set up and bounces are recorded; IP policy, stream separation and suppressions are basic or not described.

5 — Guided SPF, DKIM and DMARC set-up with a custom return path, shared IPs with a stated sender vetting policy, dedicated IPs available, automatic suppression of hard bounces and complaints, transactional and marketing mail separated by stream or IP pool, and deliverability guidance in the documentation.

8 — Dedicated IPs with automatic warm-up and pool management, a stated acceptable-use and vetting process for shared pools, feedback loops and blocklist monitoring, DMARC reports, BIMI or custom tracking domains, compliance with the Gmail and Yahoo sender requirements stated, delivery times published, and access to deliverability experts.

10 — Deliverability that can be verified: delivery time and bounce rates per mailbox provider published continuously with their method, inbox placement testing included, pool reputation shown to the customer, and a documented escalation path with mailbox providers.

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The Data Protection Officer

Authentication set-up is guided with automatic DNS for SPF, DKIM and DMARC, bounces, unsubscribes and complaints go onto the suppressions list automatically, DMARC and blocklist monitoring ship by plan, per-domain reputation statuses with pause-on-high-bounce behaviour are visible, and expert consultation is included on Professional plans. We found no public information on dedicated-IP warm-up, shared-pool vetting, feedback loops or stated compliance with the Gmail and Yahoo sender requirements; dedicated IPs are Enterprise-only and quoted by contacting support, and the SLA explicitly excludes deliverability rate and delivery time. 2 4 7 15 16

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Message logs, events & webhooks

How this is scored

What the team can see about each message once the application has handed it over: a message log searchable by recipient, subject, tag or message ID, the full event history (processed, delivered, deferred, bounced with the remote server's answer, opened, clicked, complained), how long logs and message content are kept, event webhooks with retries and a signature, an events API, dashboards and statistics per stream, tag or domain, alerts on bounce or complaint spikes, and access for a support team without developer rights.

0 — Nothing can be seen after sending; no logs, no events and no webhooks.

3 — Totals of sent and bounced messages; per-message logs, webhooks and retention are basic or not described.

5 — A searchable message log with per-message event history and the bounce reason, log retention stated, event webhooks for delivery, bounce, open, click and complaint, statistics per tag or domain, and an API to fetch events.

8 — Webhooks signed and retried with their schedule documented, the raw SMTP response and the rendered message viewable per send, log retention configurable or extended by plan, alerts on bounce, complaint or delivery-time thresholds, export or streaming of events to a named log or data tool, and read-only roles for support staff.

10 — Full traceability: every message traceable from API call to the receiving server's final answer, events streamed in real time with ordering and delivery guarantees stated, long retention with search across the whole history, and observability features documented with their limits.

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The Data Protection Officer

Every message is traceable: the Emails page is searchable by recipient, subject, message ID, template ID and tag with statuses through queued, sent, delivered and rejected, the HTML, plain-text and raw message are viewable, and the full JSON of a message can be downloaded; webhooks cover delivery, soft and hard bounce, open, click, unsubscribe and complaint, are signed with a per-account secret, and retries follow a published schedule of ten and one hundred seconds. Retention is stated per plan (one to thirty days of activity, seven days of API logs) and extendable to 365 days from $5.00. We found no public information on configurable bounce or complaint alerts, streaming to external log tools beyond CSV export, or a read-only seat for support staff. 5 7 17 18

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Message data, retention & security

How this is scored

What is stored about each message and what the customer controls: whether message bodies are stored or only metadata, retention periods and the setting to shorten them, deletion of a recipient's data on request, open and click tracking that can be switched off per stream or message, TLS for delivery with an option to require it, encryption at rest, API keys with scopes and per-domain restrictions, IP allow-listing, two-factor authentication and SSO for the dashboard, an audit log, a vulnerability disclosure programme, and security certifications or audits with their scope. Where the data is processed and by whom is scored under sovereignty.

0 — Stores every message indefinitely with no controls, and the vendor states it uses message content for its own purposes.

3 — A privacy policy and a statement that data is encrypted; what is stored, retention and access controls are basic or not described.

5 — What is stored per message documented, retention periods stated, open and click tracking switchable, TLS used for delivery, API keys with restricted permissions, two-factor authentication for the dashboard, and a data processing agreement offered.

8 — Message content retention configurable down to none or metadata only, enforced TLS per domain or message, encryption at rest stated, scoped API keys and IP allow-listing, SSO (SAML) and roles, an audit log, deletion of recipient data by API, and ISO 27001 or SOC 2 stated with its scope.

10 — Data minimisation that can be verified: every stored field and its retention listed, content never stored unless the customer opts in, customer-managed encryption keys or equivalent, independent audits published with their scope, and every security control the customer has listed with its effect.

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The Data Protection Officer

The DPA names the customer controller and MailerSend processor, data is mirrored in two EU locations with AES-256 at rest and TLS in transit, two-factor authentication with single-use recovery codes, IP allow-listing and per-domain open and click tracking switches exist, recipients can be deleted from the activity view, and the vendor assists with data-subject requests and DPIAs with breach notice within 48 hours. Two things give me pause for mail carrying patient names: the privacy policy reserves a right to monitor emails, content and response data for terms compliance (with AI and manual content checks), and message content sits in activity data whose retention extends up to 365 days rather than down to none. We found no public information on an audit log, scoped API keys, or an ISO 27001 or SOC 2 certificate covering MailerSend itself rather than its hosting provider. 7 9 10 18 19 20

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Reliability, accounts & support

How this is scored

Whether the platform can be relied on and run by a team: a public status page with incident history, uptime SLA and service credits published, redundancy or failover across data centres described, queueing and retry of mail during outages, sub-accounts or servers per application, client or tenant, team members with roles, separate environments, support channels and response times per plan, named migration help, and integrations with platforms that send mail on the customer's behalf (WordPress, Shopify, Shopware, Supabase, Vercel and similar).

0 — No status page, no support channel and no way to separate users or applications.

3 — A support contact and a single account; status page, SLA, sub-accounts and roles are basic or not described.

5 — A public status page with incident history, an uptime SLA on at least one plan, sub-accounts or separate servers per application, team members with roles, support by email or chat with stated hours, and plugins or guides for several named platforms.

8 — An SLA with service credits published, redundancy across data centres or regions described, mail queued and retried during incidents, sub-accounts with their own keys, domains and limits manageable by API, granular roles, support response times per plan, and migration assistance offered.

10 — Reliability that can be verified: uptime history published for years, post-mortems for incidents, multi-region failover documented, an SLA covering delivery latency as well as API availability, and white-label or reseller tooling for agencies and platforms.

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The Data Protection Officer

The SLA commits to 99.5% monthly uptime for API and SMTP with service credits of 5, 10 and 15 percent, data is mirrored across two locations, five user types including a granular custom role and an accountant-only seat are supported, support is 24/7 by email with live chat on higher plans, and plugins or connectors exist for WordPress, Supabase, Laravel, Symfony and Firebase. A help-centre guide covers creating sub-accounts, but we found no public information on multi-year uptime history with post-mortems, mail queueing and retry behaviour during incidents, or support response times per plan. 3 5 12 19 21 22

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European sovereignty

How this is scored

Who the contracting entity and the parent company are, where messages, logs and recipient data are processed and stored, whether an EU region can be chosen and what it covers, and who the subprocessors are (cloud hosting, sending infrastructure, logging, support and payment tools). Independently sourced by the sovereignty pipeline; every message carries personal data, so the whole sending chain counts, not only the dashboard.

0 — Non-EU vendor and contracting entity, hosting unstated, subprocessors unnamed, and no data processing agreement offered.

3 — A privacy policy and a data processing agreement exist, but hosting location is unstated or non-EU and the subprocessors are not listed.

5 — An EU region available and an EU contracting entity or EU representative, but parts of the chain (sending infrastructure, logs, support, payment) run through non-EU providers without a stated safeguard, or the EU region does not cover logs and account data.

8 — EU processing of messages, logs and account data on named infrastructure, an EU contracting entity, subprocessors listed with their locations, a data processing agreement published, and security certifications (ISO 27001, SOC 2) stated.

10 — Sovereign end to end and evidenced: European ownership, entity, hosting, sending infrastructure and every subprocessor, data export and deletion documented, and certifications published with their scope rather than implied.

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The Data Protection Officer

The contracting party is MailerSend, Inc. of New York under Delaware law with the US Federal Trade Commission as regulator, and MailerLite Limited in Dublin serves only as GDPR representative; hosting is named as Google Cloud EMEA in Belgium, and the DPA — integral to the terms of use — lists sub-processors in Annex 4, applies standard contractual clauses and claims Data Privacy Framework certification. However, the DPA permits transfers of customer data "to the United States and anywhere else in the world", named sub-processors such as Meta, Bandwidth, PostHog, Stripe and PayPal are disclosed without their locations, and the ISO 27001 certificates cited cover the storage centres rather than MailerSend. For a health sender this is workable but not sovereign: EU storage with an EU representative, an American contracting entity, and a transfer clause that reaches worldwide. 8 9 10 11 19

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Pricing transparency

How this is scored

Whether a buyer can compute the real annual cost from public pages alone: price per tier by monthly message volume, the price per additional thousand messages, the free tier and its limits, what dedicated IPs, extra log retention, sub-accounts, SSO and support plans cost, minimum term, and whether unused volume carries over.

0 — No public prices at all; every customer is a sales call.

3 — A starting price or a free tier exists, but how cost scales with volume or which features cost extra is unclear.

5 — Tiers are public with their monthly volume and price, but at least one commonly needed piece (overage rate, dedicated IP, longer log retention, SSO, support plan) is unpriced or "on request".

8 — Every tier priced publicly with its volume and overage rate per thousand messages, dedicated IPs and add-ons priced, log retention per tier stated, minimum term and VAT treatment stated.

10 — Complete price computability: annual cost derivable for a given monthly volume, number of domains and sub-accounts and feature set, with every add-on, support and overage fee and the cancellation terms published.

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The Data Protection Officer

Hobby at $6.30, Starter at $31.50 and Professional at $99.00 per month each publish volume, overage ($1.50 or $1.30 per 1,000 emails), activity-retention days and seat counts; add-ons carry exact prices (DMARC monitor $2.00 per domain, domain space $4.00, phone number $2.00, extended retention from $5.00), a free tier of 500 emails a month exists, and VAT treatment with exemption conditions plus monthly and yearly billing are stated. Dedicated IPs are Enterprise-only and priced by contacting support, and we found no public information on SSO or support-plan pricing or whether unused volume carries over. 7 8

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European sovereignty — proven facts

0 of 6 dimensions proven

Built only from facts shown on the vendor's own pages. A dimension we could not prove is left open, not scored as zero.

Hosting location Not determined ⚠ unverified — uncited Report an error
Hosting options Not determined — uncited Report an error
Open source Not determined — uncited Report an error
Data processing agreement Not determined ⚠ unverified — uncited Report an error
Transfer impact assessment Not determined — uncited Report an error

Questions about MailerSend

Is MailerSend European?

No. whats-best.ai classifies MailerSend as Rest of world.

Where does MailerSend store data?

The default storage location for customer data is not stated on the vendor’s pages as of 1 Nov 2026. The vendor’s pages mention Belgium as hosting location, per the vendor’s page captured 1 Nov 2026.

Does MailerSend have a free plan?

Yes. MailerSend has a free plan, per the vendor’s page captured 1 Nov 2026.

What are the best alternatives to MailerSend?

As of 2 Nov 2026, the panel rates Lettermint (3.5/5), Bird Email API (formerly SparkPost) (3/5) and Postmark (3/5) highest among the other 15 Transactional Email products evaluated. Ratings that look equal are rounded to half stars; the order uses the unrounded rating, then the name. The highest-rated European alternative is Lettermint (EU-Made). Ratings are the AI panel’s opinion, formed from public evidence: how scores are made. The full list, with European products first: MailerSend alternatives.

Where this could be wrong

What we left out

A claim that does not survive our checks costs us the claim, not the page. This is what was taken off this one.

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Sources (23)

The pages every claim on this page was read from — each one checked, dated, and kept verifiable.

  1. 1 Vendor homepage www.mailersend.com Checked 1 Nov 2026 Details →
  2. 2 Features page (email API) www.mailersend.com Checked 1 Nov 2026 Details →
  3. 3 Features page (SMTP relay) www.mailersend.com Checked 1 Nov 2026 Details →
  4. 4 Features page (deliverability) www.mailersend.com Checked 1 Nov 2026 Details →
  5. 5 Features page (webhooks) www.mailersend.com Checked 1 Nov 2026 Details →
  6. 6 API documentation developers.mailersend.com Checked 1 Nov 2026 Details →
  7. 7 Pricing page www.mailersend.com Checked 1 Nov 2026 Details →
  8. 8 Terms of service www.mailersend.com Checked 1 Nov 2026 Details →
  9. 9 Privacy policy www.mailersend.com Checked 1 Nov 2026 Details →
  10. 10 Data processing agreement (dpa) www.mailersend.com Checked 1 Nov 2026 Details →
  11. 11 Security / trust page (GDPR) www.mailersend.com Checked 1 Nov 2026 Details →
  12. 12 Service level agreement www.mailersend.com Checked 1 Nov 2026 Details →
  13. 13 Sending API, SMTP & developer experience — found from sitemap developers.mailersend.com Checked 1 Nov 2026 Details →
  14. 14 Sending API, SMTP & developer experience — found from sitemap developers.mailersend.com Checked 1 Nov 2026 Details →
  15. 15 Deliverability & sender reputation — found from sitemap www.mailersend.com Checked 1 Nov 2026 Details →
  16. 16 Deliverability & sender reputation — found from sitemap www.mailersend.com Checked 1 Nov 2026 Details →
  17. 17 Message logs, events & webhooks — found from sitemap www.mailersend.com Checked 1 Nov 2026 Details →
  18. 18 Message logs, events & webhooks — found from sitemap www.mailersend.com Checked 1 Nov 2026 Details →
  19. 19 Message data, retention & security — found from sitemap www.mailersend.com Checked 1 Nov 2026 Details →
  20. 20 Message data, retention & security — found from sitemap www.mailersend.com Checked 1 Nov 2026 Details →
  21. 21 Reliability, accounts & support — found from sitemap www.mailersend.com Checked 1 Nov 2026 Details →
  22. 22 Reliability, accounts & support — found from sitemap www.mailersend.com Checked 1 Nov 2026 Details →
  23. 23 Code repository (open-source licence) — found from the homepage github.com Checked 1 Nov 2026 Details →