Question 1

What is Sendkit and how is it different from SendGrid, Resend, or Mailgun?

Accepted Answer

Sendkit is a modern email platform built for developers and growth teams who want one place to handle transactional email, marketing campaigns, automations, contacts, and AI agents. Unlike legacy ESPs that bolt features on year by year, Sendkit was designed from the start with a clean API, a Notion-style editor, native MCP support for AI clients, and a single price that includes everything.

Question 2

Who is Sendkit for?

Accepted Answer

Sendkit is built for indie hackers, SaaS startups, and product teams that need reliable transactional email plus a real marketing toolset without paying two vendors. Devs use the API and SMTP relay, marketers use campaigns and automations, and AI agents use the MCP server — all from the same account.

Question 3

Can non-developers use Sendkit?

Accepted Answer

Yes. The dashboard ships with a visual campaign editor, drag-and-drop list management, and analytics that don't require touching code. You only need a developer for the parts that involve your app — sending transactional email through the API or SMTP.

Question 4

Where does Sendkit run?

Accepted Answer

Sendkit runs on Cloudflare's global edge network for the dashboard and on managed sending infrastructure for outbound email. That means low-latency dashboard access from anywhere and high-throughput delivery without you provisioning anything.

Question 5

Is Sendkit reliable for production traffic?

Accepted Answer

Yes. Sendkit handles transactional traffic for paying customers today, with retries, suppression management, and bounce categorization built in. The same infrastructure used for free-tier accounts handles high-volume senders — there is no second tier of reliability.

Question 6

How fast does Sendkit deliver email?

Accepted Answer

Most transactional sends are accepted by the recipient mailbox within seconds. The API itself responds in tens of milliseconds, then queues the message for sending. For time-sensitive flows like password resets and OTPs, this is well within user expectations.

Question 7

Is there a free plan?

Accepted Answer

Yes. The free tier includes 3,000 emails per month, all features (campaigns, automations, contacts, MCP, API), and no credit card required. It's enough to validate an integration end to end before you upgrade.

Question 8

How does Sendkit pricing work?

Accepted Answer

Plans are priced per email sent, not per contact. You pick a monthly volume that matches your sending and you get the full product on every tier — the only thing that changes between plans is the number of emails included.

Question 9

Do you charge per contact?

Accepted Answer

No. Contacts and lists are always unlimited. Billing is based on emails sent, which keeps the math simple: if you don't send, you don't pay extra, even with a million contacts in your database.

Question 10

What happens if I exceed my plan?

Accepted Answer

We notify you when you reach 80% of your monthly quota and let you either upgrade instantly or top up with additional volume at a flat per-thousand rate. We don't block sends mid-campaign without warning.

Question 11

Can I upgrade or downgrade anytime?

Accepted Answer

Yes. Plan changes take effect immediately and we prorate the difference. There are no annual contracts and no penalties for downgrading or canceling.

Question 12

Are there hidden fees?

Accepted Answer

No. The only optional add-on is a dedicated IP for high-volume senders. Everything else — automations, MCP, API access, webhooks, analytics — is included in every plan, including the free tier.

Question 13

What does the Sendkit Email API support?

Accepted Answer

A clean REST API for sending single or batched messages, managing templates, fetching events (delivered, opened, clicked, bounced, complained), and handling suppressions. Authentication is a single API key, and responses are typed JSON.

Question 14

Can I use Sendkit as an SMTP relay?

Accepted Answer

Yes. Every account gets an SMTP host, port, and credentials. Drop them into your existing app, framework, or CMS and you're sending through Sendkit without rewriting any code. Bounce handling and suppressions work the same as with the API.

Question 15

Are there SDKs?

Accepted Answer

Yes, official SDKs for the most common stacks. The API is also intentionally simple enough that you can call it directly with fetch or curl if you prefer.

Question 16

Do you support webhooks?

Accepted Answer

Yes. Configure a webhook URL and Sendkit will POST signed events for delivered, bounced, complained, opened, clicked, and unsubscribed. Use them to sync state with your app in real time.

Question 17

Is the API compatible with SendGrid, Postmark, or Resend APIs?

Accepted Answer

Sendkit's API is designed to be familiar to anyone migrating from another provider. The shapes of the request and response objects map cleanly, and the SDKs cover the most common patterns so swapping providers is usually a few-hour job, not a rewrite.

Question 18

Can I send newsletters and marketing campaigns with Sendkit?

Accepted Answer

Yes. The same account that sends your transactional email also runs your campaigns. There's a visual editor, list management, segmentation, and reporting — no need to glue Mailchimp onto Postmark.

Question 19

Is there a visual editor?

Accepted Answer

Yes. The campaign editor is block-based and works for both technical and non-technical users. You can also paste raw HTML, use React Email, or import templates if you'd rather build elsewhere.

Question 20

Can I segment my audience?

Accepted Answer

Yes. Create dynamic segments based on contact properties, tags, engagement (opens, clicks), or custom events from your app. Segments update automatically as contacts change.

Question 21

Does Sendkit support automations and drip sequences?

Accepted Answer

Yes. Build welcome flows, drip campaigns, and event-triggered sequences with a visual workflow editor. Triggers can be API events, contact property changes, or scheduled times.

Question 22

Can I A/B test subject lines and content?

Accepted Answer

Yes. Run A/B tests on subject line, sender name, or full email content. Sendkit picks the winner automatically based on the metric you choose.

Question 23

How does Sendkit ensure good deliverability?

Accepted Answer

Sendkit enforces SPF, DKIM, and DMARC alignment, monitors sender reputation per domain, automatically suppresses hard bounces and complaints, and isolates noisy senders before they hurt the rest of the pool. The dashboard surfaces deliverability signals so you know what to fix.

Question 24

Do you support SPF, DKIM, and DMARC?

Accepted Answer

Yes. Sendkit generates the DNS records you need during onboarding and verifies them automatically. DMARC reports can be aggregated in the dashboard for domains you manage.

Question 25

Do I get a dedicated IP?

Accepted Answer

Shared IPs are warmed up and included for all plans. Dedicated IPs are available as an add-on for senders doing 250k+ emails per month who want full control over their reputation.

Question 26

Do you help with IP and domain warmup?

Accepted Answer

Yes. Sendkit ramps your sending volume gradually on new domains and dedicated IPs and adjusts pacing automatically based on engagement signals from major mailbox providers.

Question 27

How are bounces and complaints handled?

Accepted Answer

Hard bounces and spam complaints are automatically added to your suppression list and never re-sent. Soft bounces are retried with backoff. Everything is visible in the dashboard and exposed via webhooks if you want to sync to your app.

Question 28

What is the Sendkit MCP server?

Accepted Answer

MCP (Model Context Protocol) is the open standard that lets AI clients call tools on your behalf. Sendkit exposes its full API — sending, contacts, segments, campaigns, analytics — as MCP tools, so an AI agent connected to your Sendkit account can do real email work without any custom glue.

Question 29

Which AI clients work with Sendkit MCP?

Accepted Answer

Any MCP-compatible client. That includes Claude Desktop, Cursor, VS Code, ChatGPT, Gemini, and any tool built on the MCP standard. One config file in the client and your agent has email superpowers.

Question 30

Can my AI agent send emails through Sendkit?

Accepted Answer

Yes. Once the MCP server is connected, an agent can compose, segment, schedule, and send email autonomously. You stay in control via per-tool permissions and audit logs of every action the agent takes.

Question 31

Does Sendkit charge extra for MCP?

Accepted Answer

No. MCP is included on every plan, including the free tier. The emails an agent sends count against your normal monthly quota — there's no separate billing.

Question 32

Is Sendkit GDPR compliant?

Accepted Answer

Yes. Sendkit is built to GDPR requirements: lawful processing, data minimization, right to erasure, and contact-level audit trails. EU customers can request a Data Processing Agreement (DPA) at any time.

Question 33

Where is my data stored?

Accepted Answer

Sendkit runs on Cloudflare's global edge with regional data residency options. EU customer data can be pinned to EU regions on request.

Question 34

Do you sign DPAs?

Accepted Answer

Yes. A standard Data Processing Agreement is available on request for any plan, including the free tier.

Question 35

Is data encrypted in transit and at rest?

Accepted Answer

Yes. All connections use TLS 1.2+ in transit and AES-256 at rest. API keys are hashed and webhook payloads are signed with HMAC.

Question 36

Can I delete my account and data?

Accepted Answer

Yes. You can permanently delete your account, contacts, and historical event data from the dashboard at any time. Deletion is irreversible and propagates to backups within 30 days.

Question 37

Do you comply with CAN-SPAM and other email laws?

Accepted Answer

Yes. Sendkit enforces unsubscribe links on marketing email, suppresses contacts who unsubscribe automatically, and supports the headers required by Gmail's and Yahoo's bulk sender requirements.

Question 38

What support channels do you provide?

Accepted Answer

Email support on every plan, including the free tier. Higher-volume plans get priority routing and a shared Slack channel for engineering questions and deliverability help.

Question 39

What's the response time?

Accepted Answer

Most tickets are answered within 24 hours on standard support and within a few hours on priority support. Critical incidents (delivery failures, account issues) are escalated automatically.

Question 40

Do you help with onboarding and migrations?

Accepted Answer

Yes. We help teams migrating from another provider map their templates, set up authentication, warm up domains, and validate the integration before they cut traffic over.

Question 41

Is there a knowledge base?

Accepted Answer

Yes. Guides cover authentication, API usage, deliverability best practices, MCP setup, and migration playbooks for the major ESPs. Everything is open and indexable, no login required.

Questions about Sendkit?

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