Knowledge base
SendNeo docs
Everything about sending transactional email with SendNeo, from the first test key to webhooks and agents.
SendNeo QuickstartSend your first transactional email with SendNeo using curl, Node.js, or Python, then test safely before going live.Sending Email with SendNeoThe SendNeo email request, batch sends, schedules, cancellations, idempotency, attachments, templates and errors.TemplatesSave transactional emails once and send them with one API call and a few variables.Verify a Sending DomainAdd SendNeo DNS records with Cloudflare, GoDaddy, or Namecheap, verify the domain, and roll out DMARC safely.SendNeo Test ModeExercise SendNeo integrations with free test keys and deterministic delivered, bounced, and complained addresses.SendNeo WebhooksReceive SendNeo delivery and contact events, verify SendNeo-Signature HMACs, and reject stale webhook requests.Email validationCheck an address before you add or send to it — syntax, typos, disposable and role addresses, and mail servers.SendNeo MCP ServerConnect Claude, ChatGPT, Cursor, Codex, GitHub Copilot or Gemini CLI to SendNeo through the hosted MCP server.SDKs and code samplesSend an email from Node.js, Python, PHP, Ruby, Go, Rust, Java, .NET or Elixir with copy-ready code, or keep using a Resend SDK.CLISend email, check delivery, manage domains and read events from your terminal with the single-file SendNeo CLI.SMTP relaySend through SendNeo from WordPress, legacy apps and devices over SMTP, with an API key as the password.SendNeo Deliverability GuideSendNeo's automatic guardrails, domain authentication, warm-up and review, and the signals to watch for transactional mail.Team and rolesInvite teammates to your SendNeo account and choose what each person can do.Migrate from Resend to SendNeoMove a Resend integration to SendNeo with one base URL change, compatible requests, and a clear endpoint mapping.Resend-compatible extrasReference for the audiences, contacts and broadcasts endpoints SendNeo keeps for Resend compatibility and existing integrations.