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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: AI-assisted analysis on whats-best.ai MailerSend: AI-assisted analysis on whats-best.ai (dark)

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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 SaaS Developer

Weighted verdict

Backend developer at a twelve-person B2B SaaS in Hamburg, built on Laravel, that sends sign-up confirmations, password resets, invoices and weekly digests to 40,000 users. Has replaced the mail driver once already and does not want to again. Wants an official driver for the framework, templates with variables, a test mode that never reaches a real inbox, signed webhooks for bounces, and a log that answers "did this user get the reset mail?" without opening a ticket.

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

Scored by The SaaS Developer

Panel median The SaaS Developer 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 SaaS Developer
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 SaaS Developer

Sending mail is genuinely easy here: a REST API and an SMTP relay with their limits documented (five messages per SMTP connection, TLS on port 587 only, IP-based rate limits lower than the API), seven official SDKs including a vendor-maintained Laravel package, stored templates with personalisation variables, a bulk endpoint, inbound routing, an OpenAPI collection, a CLI, and a sandbox mode with its own domain for testing. We found no public information on idempotency keys, template versioning or a migration guide from named competitors, and the SMTP relay explicitly supports neither templates nor advanced personalisation. 2 5 6 7 13 14 21

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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 SaaS Developer

Auto DNS set-up for SPF, DKIM and DMARC, instant suppressions for bounces, unsubscribes and spam complaints, blocklist and DMARC monitors per plan, per-domain reputation statuses with webhooks and automatic pausing when bounce or complaint rates climb, and deliverability consultation on the higher plans cover most of what keeps my password resets landing. We found no public information on shared-pool vetting, dedicated-IP warm-up (dedicated IPs are Enterprise-only, priced by contacting support), separation of transactional and marketing streams, feedback loops, Gmail and Yahoo sender rules, or published delivery times — and the SLA explicitly excludes delivery time and deliverability rate from its credits. 2 4 7 12 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 SaaS Developer

The question I actually ask — did this user get the reset mail — is answerable from the captured pages: the email log is searchable by recipient, subject, tag and message ID, per-message statuses and interactions are recorded, each message is viewable as HTML, plain text and raw, activity exports to CSV, and webhooks for delivery, soft and hard bounces, opens, clicks and spam complaints are signed with a unique secret key and retried twice on a documented schedule with a three-second timeout. Activity retention is seven days on Starter and thirty on Professional with a paid extension to 365 days; we found no public information on native alerts for bounce or complaint spikes, or on streaming events to a log platform. 3 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 SaaS Developer

Encryption at rest (AES256) and in transit, a TLS-only SMTP relay on port 587, IP allow-listing, two-factor authentication with recovery codes and bulk enforcement, SSO, five user types with granular permissions, open and click tracking behind a domain setting, per-recipient deletion with GDPR tools for data subject requests, plus a DPA and ISO 27001 on the storage centre. We found no public information on scoped API keys, an audit log, a vulnerability disclosure programme, or any way to retain no message content — activity retention simply follows the plan. 1 7 10 13 18 20 21

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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 SaaS Developer

There is a published SLA with tiered service credits for both API and SMTP uptime, 24/7 support with per-plan channels, granular roles, a sandbox environment, and a WordPress plugin plus guides for Supabase, Laravel and Symfony. We found no public information on incident history or post-mortems, queueing of mail during outages, or per-plan response times; redundancy is documented only as data mirrored in two locations, creating multiple accounts is forbidden, and client separation runs through domains and sender identities — a help page on creating sub-accounts is among the captured pages, but we found no confirmed details from it. 1 3 5 7 8 9 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 SaaS Developer

Data storage is documented as EU — a Google Cloud EMEA centre in Belgium — with MailerLite Limited of Dublin as the EU GDPR representative, a DPA folded into the terms of use with Standard Contractual Clauses, and a subprocessor list in the DPA annex naming Stripe, PayPal, Braintree, Meta, Bandwidth, PostHog and others. The contracting entity is MailerSend, Inc. of New York under Delaware law, and the DPA permits processing customer data in the United States and anywhere else in the world where subprocessors operate; subprocessor locations are not published. 8 9 10 11

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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 SaaS Developer

Tiers, volumes and overage rates are public — $6.30 for Hobby at 5,000 emails a month, $31.50 for Starter and $99 for Professional at 50,000, extra usage at $1.50 and $1.30 per thousand emails, a free tier of 500 emails a month, activity retention per plan with a paid extension to 365 days from $5.00, DMARC monitors at $2 per domain and domain spaces at $4 — plus VAT treatment, monthly or yearly terms with a 10% yearly discount and cancellation without penalty. Dedicated IPs are "Contact our support team", we found no public information on the Starter plan's overage rate or SSO pricing, and the captured pages give different figures for the entry price — "as little as $7" on the SMTP page against $6.30 on the pricing page. 3 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 →