SparkPost Integrations: Native, Zapier, and API

For most WordPress sites the shortest path is a plugin. The official SparkPost plugin at wordpress.org/plugins/sparkpost routes wp_mail through the HTTP API, and WP Mail SMTP, FluentSMTP and Post SMTP all ship first-party or endorsed SparkPost drivers. Choose the plugin flow when you want logging, DKIM validation and a test-send button inside wp-admin. Fall back to the raw SMTP relay (smtp.sparkpostmail.com on port 587) only when you are relaying from a hardened WordPress build that cannot load third-party plugins, or when you want to route mail through Postfix on the same host.

SparkPost publishes first-party or SparkPost-branded integrations for WordPress (via the sparkpost plugin, WP Mail SMTP, FluentSMTP and Post SMTP), Node.js via the nodemailer-sparkpost-transport package, Exim and Postfix as documented smarthost setups, and the Postman collection covering the full v1 REST API. Other language SDKs (Python, PHP, Go, Java) plug into any framework that speaks HTTP. Beyond that catalog everything else is a REST or SMTP integration you wire yourself.

Install the official SparkPost Zapier app from zapier.com/apps/sparkpost and authenticate with an API key that has the Transmissions:Read/Write permission enabled. The primary action is Send Email (single or templated transmission with substitution data), and the app pairs with 9,000+ Zapier apps as triggers — Stripe payments, Typeform submissions, HubSpot contact updates, Airtable rows and so on. There is no polling trigger on SparkPost engagement events; for those you register a SparkPost webhook and let Zapier consume it through a Webhooks by Zapier catcher.

Yes. SparkPost push webhooks POST delivery, bounce, open, click, unsubscribe and spam-complaint events to any HTTPS endpoint you register at /api/v1/webhooks. For Slack the simplest path is the Zapier SparkPost app with the Slack trigger. For Segment, terminate the webhook on a small consumer and forward as track() calls. For a warehouse, most teams land the webhook payload in S3 or Amazon SNS / SQS then load into Snowflake, BigQuery or Redshift. Signals Analytics also exposes aggregate metrics at /api/v1/metrics/deliverability that can be pulled into Datadog or New Relic on a schedule.

Not as first-party connectors. All three are reachable through the official Zapier SparkPost app: HubSpot workflow events, Salesforce lead/opportunity triggers and Mailchimp subscriber sync can all fire SparkPost Send Email actions or update SparkPost recipient lists. For high-throughput CRM-driven sending most teams skip Zapier and call the Transmissions API directly from their CRM webhook handler — Zapier fits ad-hoc automations up to a few thousand messages per day.

Register the receiving domain at /api/v1/inbound-domains, point its MX records at rx1.sparkpostmail.com and rx2.sparkpostmail.com, then create a Relay Webhook at /api/v1/relay-webhooks pointing at your HTTPS endpoint. SparkPost then POSTs the parsed inbound message as JSON, including headers, text and HTML parts and any attachments as base64. This is how teams build reply parsing for ticketing systems, unsubscribe-by-reply flows or newsletter reply-to-editor loops. Note that inbound is region-specific — EU accounts use the EU relay hosts.