--- title: "Connect Harpoon to Smtp2Go - APIANT.ai" description: "When \"New Client\" fires in Harpoon, your agent runs \"Add email\" in Smtp2Go. Describe the whole flow and it is built, tested on every scenario and kept running." canonical: "https://apiant.ai/connect/harpoon-to-smtp2go" --- # Connect Harpoon to Smtp2Go When **New Client** fires in [Harpoon](https://apiant.ai/connections/harpoon), your agent runs **Add email** in [Smtp2Go](https://apiant.ai/connections/smtp2go). Describe the whole flow and it is built, tested on every scenario and kept running. Harpoon **9** triggers Harpoon **46** actions Smtp2Go **22** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want Harpoon and Smtp2Go 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 Harpoon can start in Smtp2Go - When **New Client** in Harpoon then **Add email** in Smtp2Go - When **New Contact** in Harpoon then **Add single sender email** in Smtp2Go 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 Harpoon and Smtp2Go ## Triggers and actions 9 triggers · 68 actions - Trigger **New Client** Triggered when a new client is created in Harpoon. - Trigger **New Contact** Triggered when a new contact is created in Harpoon. - Trigger **New Expense** Triggered when a new expense is created in your Harpoon account. - Trigger **New Expense Category** Triggered when a new expense category is created in Harpoon. - Trigger **New Invoice** Triggered when a new invoice is created in Harpoon. - Trigger **New Payment** Triggered when a new payment is recorded in your Harpoon account. - Trigger **New Project** Triggered when a new project is created in Harpoon. - Trigger **New Task Category** Triggered when a new task category is added in your Harpoon account. - Trigger **New Time Entry** Triggered when a new time entry is logged in Harpoon. - Action **Add Credit Entry** Creates a new credit entry on a client's account in Harpoon, recording an amount, a date and an optional note or originating invoice. Returns the credit entry that was created. - Action **Add Invoice** Creates a new invoice in Harpoon for a client or project, with an invoice number, issue date, and optional line items. Returns the invoice that was created. - Action **Add Lead Source** Creates a new lead source in Harpoon, so new clients can be tagged with where they came from. Returns the lead source that was created. - Action **Add Note** Adds a note to a client, project or invoice in Harpoon. Returns the note that was created. - Action **Add Team** Creates a new team in your Harpoon account. Harpoon populates the new team from your account details; the API accepts no team attributes on creation. - Action **Clone Time Entry** Creates a copy of an existing time entry in Harpoon. The copy keeps the original's project, task and description, and starts with today's date and zero hours logged. - Action **Create Contact** Creates a contact person under a Harpoon client, with their name, email address, and phone number. Returns the contact that was created. - Action **Create Expense** Records a one-off expense in Harpoon with its date, amount, and vendor, optionally attributed to a client, project, or expense category. Returns the expense that was created. - Action **Create Expense Category** Creates a new expense category in your Harpoon account so expenses can be grouped under it. - Action **Create Project** Creates a project in Harpoon for a client, with its budget, rate, and start and end dates. Returns the project that was created. - Action **Create Time Entry** Logs hours worked in Harpoon for a team member on a given date, optionally against a client or project. Returns the time entry that was created. - Action **Delete Client** Deletes a client from your Harpoon account. - Action **Delete Expense** Permanently deletes an expense from your Harpoon account. - Action **Delete Invoice** Permanently removes an invoice from Harpoon. Returns Harpoon's confirmation that the invoice was deleted. - Action **Delete Note** Deletes a note from your Harpoon account. - Action **Delete Recurring Expense** Deletes a recurring expense template from Harpoon by its id, so it stops generating new expenses. - Action **Delete Recurring Invoice** Stops and removes a recurring invoice schedule in Harpoon so it no longer generates invoices. Returns Harpoon's confirmation that it was deleted. - Action **Delete Time Entry** Deletes a time entry from your Harpoon account. - Action **Get Client** Returns a single client from your Harpoon account, including its name, contact details and other stored attributes. - Action **Get Client Credits** Returns a client's credit entries in Harpoon, along with the credit still available on the account. - Action **Get Contact** Returns a single Harpoon contact, including their name, email address, phone number, and the client they belong to. - Action **Get Estimate** Returns a single estimate from your Harpoon account, including its client, line items, totals and status. - Action **Get Expense** Returns a single expense from your Harpoon account, including its amount, date, vendor, category and the client or project it is attached to. - Action **Get Expense Category** Returns a single Harpoon expense category with every detail it carries, including its name and budget settings. - Action **Get Invoice** Fetches one invoice from Harpoon by its id, with its client, line items and payment totals. An error occurs if the invoice is not found. - Action **Get Lead Source** Returns a single lead source from your Harpoon account. - Action **Get Project** Returns a single project from your Harpoon account, including its client, budget and status. - Action **Get Recurring Expense** Fetches one recurring expense template from Harpoon by its id, with its vendor, amount, frequency and schedule. An error occurs if it is not found. - Action **Get Recurring Invoice** Returns a single recurring invoice schedule from Harpoon, including its client, frequency, dates, and line items. - Action **Get Task** Returns a single task category from your Harpoon account, including its name and hourly rate. - Action **Get Team** Returns a single team from your Harpoon account, including its name, email address, phone, address, owner and whether it is active. - Action **Get Time Entry** Returns a single tracked time entry from your Harpoon account, including its date, hours, client, project and notes. - Action **List Contacts** Returns the contacts in your Harpoon account, including each contact's name, email address and phone number. - Action **List Estimates** Returns the estimates in a Harpoon account, optionally narrowed to a year, client, project, status, or search text. - Action **List Expense Categories** Returns the expense categories set up in Harpoon, each with its budget settings. - Action **List Expenses** Returns the expenses in your Harpoon account, optionally narrowed by date range, client, project, category, billing status or search text. - Action **List Invoices** Returns the invoices in your Harpoon account, optionally narrowed by year, client, project, status or a search term. - Action **List Projects** Returns the projects in a Harpoon account, with their client, budget, rate, and dates. - Action **List Teams** Returns the teams in your Harpoon account, along with the total number of teams found. - Action **List Time Entries** Returns time entries from your Harpoon account — either the timers running now or logged history for a date range — optionally narrowed by client, project, task, team member or billing status. - Action **Update Expense** Updates an existing expense in your Harpoon account. Only the values you supply are changed. - Action **Update Invoice** Updates an existing invoice in your Harpoon account. Only the values you supply are changed. - Action **Update Project** Updates an existing project in Harpoon — its name, client, billing type, status, dates, budget and task rates. Returns the updated project. - Action **Update Recurring Expense** Updates a recurring expense in Harpoon — its vendor, amount, frequency, category, dates, and status. Anything left blank keeps its current value. Returns the updated recurring expense. - Action **Update Recurring Invoice** Updates an existing recurring invoice template in your Harpoon account. Only the values you supply are changed. - Action **Update Time Entry** Updates an existing time entry in Harpoon — its date, hours, description, project, task or billing state. - Action **Add email** Sends an email through SMTP2GO, either with your own subject and body or from a saved template, optionally scheduled for later delivery. - Action **Add sender domain** Adds a sender domain to your SMTP2GO account and returns the DNS records needed to verify it. - Action **Add single sender email** Add a single verified sender email address. - Action **Add SMTP user** Adds a new SMTP user to your SMTP2GO account, with its password, rate limit, tracking, archiving, feedback footer and bounce settings. - Action **Add suppression** Suppresses an email address or a whole domain so SMTP2GO no longer delivers to it. - Action **Add template** Creates an email template with a subject, HTML and plain-text content, and optional variables and tags. - Action **Delete scheduled email** Cancels an email that was scheduled to be sent later, using its schedule ID. - Action **Delete sender domain** Remove a sender domain. - Action **Delete single sender email** Removes a single sender email address from your SMTP2GO account (or a subaccount). - Action **Delete SMTP user** Remove an SMTP user. - Action **Delete suppression** Removes the suppression on an email address or domain so SMTP2GO will deliver to it again. - Action **Delete template** Remove an email template. - Action **Find scheduled emails** Returns emails that are scheduled to send later, optionally narrowed by schedule ID, subject, recipient or sender. - Action **Get template** View details of a specific email template. - Action **List emails** Lists sent emails (up to 5,000) matching the supplied date range and filters. - Action **List sender domains** Returns the sender domains on the SMTP2GO account, with their DNS verification details and tracking subdomains. - Action **List single sender emails** Lists the single sender email addresses on the SMTP2GO account with their verification status, optionally narrowed to one address. - Action **List SMTP users** View SMTP users. - Action **List subaccounts** Lists the subaccounts on the SMTP2GO account, optionally narrowed by search terms and state. - Action **List suppressions** View suppressed email addresses. - Action **List templates** Lists the email templates in your SMTP2GO account, optionally narrowed by search terms or tags. - Action **Update template** Changes the details of an existing SMTP2GO email template. Only the values you fill in are changed. ## Each app on its own - [ **Harpoon** Harpoon is a financial planning, scheduling, time-tracking, invoicing, and budgeting platform for...](https://apiant.ai/connections/harpoon) - [ **Smtp2Go** Transactional email delivery service and API for sending, tracking, and monitoring bulk and transactional...](https://apiant.ai/connections/smtp2go) Reviews ## What our customers say ## More from Harpoon - [ **Harpoon to Bugcrowd** Bugcrowd API for interacting and tracking the reported issues programmatically](https://apiant.ai/connect/harpoon-to-bugcrowd) - [ **Harpoon to HubSpot** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/harpoon-to-hubspot) - [ **Harpoon to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/harpoon-to-salesforce) - [ **Harpoon to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/harpoon-to-slack) - [ **Harpoon to Google Sheets** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/harpoon-to-google-sheets) - [ **Harpoon to Gmail** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/harpoon-to-gmail) ## More into Smtp2Go - [ **HubSpot to Smtp2Go** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-smtp2go) - [ **Salesforce to Smtp2Go** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-smtp2go) - [ **Slack to Smtp2Go** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-smtp2go) - [ **Google Sheets to Smtp2Go** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/google-sheets-to-smtp2go) - [ **Gmail to Smtp2Go** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-smtp2go) - [ **Google Calendar to Smtp2Go** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-smtp2go) Questions ## Harpoon and Smtp2Go, answered ### ### What can start an automation from Harpoon? Any of Harpoon's 9 triggers in the catalog, including New Client, New Contact, New Expense and New Expense Category. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in Smtp2Go when something happens in Harpoon? Any of Smtp2Go's 22 actions, including Update template, Add email, Add sender domain and Add single sender email. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from Smtp2Go to Harpoon? Smtp2Go has no triggers in the catalog today, so automations start in Harpoon. If you need the other direction, ask: your agent reads Smtp2Go's API documentation and adds it. ### ### Do I have to build a connector for Harpoon or Smtp2Go? 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 Harpoon and Smtp2Go 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.