--- title: "Connect Mailrelay and PostHog - APIANT.ai" description: "When \"New subscriber\" fires in Mailrelay, your agent runs \"Capture Event\" in PostHog, or \"Action Performed\" in PostHog to \"Add campaign\" in Mailrelay." canonical: "https://apiant.ai/connect/mailrelay-to-posthog" --- # Connect Mailrelay and PostHog When **New subscriber** fires in [Mailrelay](https://apiant.ai/connections/mailrelay), your agent runs **Capture Event** in [PostHog](https://apiant.ai/connections/posthog), or **Action Performed** in PostHog to **Add campaign** in Mailrelay. Describe the whole flow and it is built, tested on every scenario and kept running. Mailrelay **1** trigger Mailrelay **11** actions PostHog **1** trigger PostHog **10** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want Mailrelay and PostHog to do together? Give your AI client this address. `https://mcp.apiant.ai` One connection does both: ask your client to act in an app once, or have it build an automation that keeps running. Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser. ### Set it up in your client ### Claude Code Run this in the directory you want to work in. `claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai` Start Claude Code there, approve the server, and sign in in the browser page it opens. [Claude Code guide (opens in a new tab)](https://apiant.ai/docs/mcp/claude-code) ### Claude, web and desktop Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Cursor Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Zed Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Codex and the ChatGPT desktop app Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Any other MCP client Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) Example flows ## What Mailrelay and PostHog can do together ### From Mailrelay to PostHog - When **New subscriber** in Mailrelay then **Capture Event** in PostHog - When **New subscriber** in Mailrelay then **Add annotation** in PostHog ### From PostHog to Mailrelay - When **Action Performed** in PostHog then **Add campaign** in Mailrelay - When **Action Performed** in PostHog then **Add group** in Mailrelay Starting points drawn from the triggers and actions in the catalog today. Describe the flow you need, at any depth, and your agent builds it and tests every scenario before it ships. Everything your agent can do with Mailrelay and PostHog ## Triggers and actions 2 triggers · 21 actions - Trigger **New subscriber** Polling trigger for newly created subscribers. - Action **Add campaign** Create a campaign. - Action **Add group** Create a group. - Action **Add subscriber** Create a subscriber. - Action **Delete subscriber** Remove a subscriber. - Action **Find subscribers by criteria** Search subscribers using q[field_predicate] filters. - Action **Get campaign** Get a campaign by id. - Action **Get subscriber** Get a subscriber by id. - Action **List campaigns** List campaigns. - Action **List groups** List groups. - Action **List senders** List senders. - Action **Update subscriber** Update a subscriber. - Trigger **Action Performed** Triggers when an action is performed by a user. - Action **Add annotation** Create a new annotation on the project timeline (content, date_marker, scope). - Action **Capture Event** Captures an event. - Action **Evaluate feature flags** Evaluate all feature flag values for a given distinct_id/person, returning flag states for use in automation branching. - Action **Get person** Retrieve a single person by ID. - Action **List annotations** List annotations in the project. - Action **List cohorts** List cohorts defined in the project. - Action **List feature flags** List feature flags defined in the project. - Action **List insights** List saved insights (charts/graphs) in the project. - Action **List persons** List/search persons in the project, optionally filtered by distinct_id or properties. - Action **Update person** Update a person's properties by ID. ## Each app on its own - [ **Mailrelay** Mailrelay is an advanced email marketing platform with powerful features.](https://apiant.ai/connections/mailrelay) - [ **PostHog** PostHog is the single platform for building successful products.](https://apiant.ai/connections/posthog) Reviews ## What our customers say ## More from Mailrelay - [ **Mailrelay to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/mailrelay-to-salesforce) - [ **Mailrelay to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/mailrelay-to-slack) - [ **Mailrelay to Stripe** Stripe is a payment processing platform for online businesses.](https://apiant.ai/connect/mailrelay-to-stripe) - [ **Mailrelay to Shopify** Shopify is a commerce platform for online stores and retail point-of-sale.](https://apiant.ai/connect/mailrelay-to-shopify) - [ **Mailrelay to QuickBooks Online** QuickBooks Online accounting — manage customers, invoices, bills, payments, vendors, expenses, and more via...](https://apiant.ai/connect/mailrelay-to-quickbooks-online) - [ **Mailrelay to Pipedrive** Pipedrive is a sales CRM and pipeline management tool.](https://apiant.ai/connect/mailrelay-to-pipedrive) ## More into PostHog - [ **Google Sheets to PostHog** Google Sheets](https://apiant.ai/connect/google-sheets-to-posthog) - [ **HubSpot to PostHog** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-posthog) - [ **Salesforce to PostHog** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-posthog) - [ **Google Calendar to PostHog** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-posthog) - [ **Google Drive to PostHog** Google Drive is a cloud storage solution for uploading, sharing, and collaborating on files across devices...](https://apiant.ai/connect/google-drive-to-posthog) - [ **Mailchimp to PostHog** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/mailchimp-to-posthog) Questions ## Mailrelay and PostHog, answered ### ### What can start an automation from Mailrelay? Any of Mailrelay's 1 trigger in the catalog, including New subscriber. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in PostHog when something happens in Mailrelay? Any of PostHog's 10 actions, including Update person, Add annotation, Capture Event and Evaluate feature flags. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from PostHog to Mailrelay? Yes. When something happens in PostHog, your agent can act in Mailrelay too. This page covers both directions: PostHog's triggers and Mailrelay's actions are listed here as well. ### ### Do I have to build a connector for Mailrelay or PostHog? No. Both are in the catalog with their triggers and actions. You describe the automation; your agent builds it, tests every scenario and keeps it running. ### ### Can my AI client use Mailrelay and PostHog without building an automation? Yes. With your AI client connected to APIANT, ask it to do something in either app once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running. One connection covers both. ### ### What happens when something fails? Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships. ### ### Is there a free plan? Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.