send16-mcp

Email for AI agents: send mail, manage contacts, automations & webhooks.

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What it can do

What data it sees

Do you need an account

No: the server works without sign-in

Email for AI agents: send mail, manage contacts, automations & webhooks. Zero-DNS first send.

How to connect

How to connect send16-mcp to Claude

The server address to paste into Claude settings:

https://mcp.send16.com/mcp

Open Claude (claude.ai or the desktop app).
Go to Settings → Connectors.
Click Add custom connector.
Paste the server address copied below into Remote MCP server URL and click Add.
In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect send16-mcp to ChatGPT

The server address to paste into ChatGPT settings:

https://mcp.send16.com/mcp

Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
Open Settings → Connectors and click Create.
Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect send16-mcp to Cursor

The server address to paste into Cursor settings:

https://mcp.send16.com/mcp

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (79)

Raw names from tools/list. Only developers need these.

whoami	Verify the API key and return the authenticated workspace: name, plan, email quota (used/limit), and owner. Call this first to confirm the key works before sending. Pair with list_domains to see which `from` addresses are allowed.
send_email	Send a transactional email through Send16. Provide `html`, `text`, or both (text-only is fine for OTPs/receipts/alerts). `from_email` must belong to a domain that is verified in the workspace — call `whoami` for the account and `list_domains` to see which senders are allowed; a send from an unverified domain returns a clear error, not a silent failure. For a zero-setup first send, use from_email `onboarding@send16.com` — the sandbox sender delivers with no DNS, but only to your own account email.
send_campaign_test	Send a test email for an existing campaign to preview how it will look in recipients' inboxes.
create_campaign	Create a new email campaign as a draft: optionally with full HTML content and recipients (exactly ONE of audienceIds / segmentId / contactIds / tagIds / sendToAll) so it's ready to test and send. Nothing is sent until schedule_campaign.
design_email_template	Use AI to generate a complete email HTML template based on a description. Returns ready-to-use HTML that can be sent or used in campaigns.
list_campaigns	List email campaigns, newest first. Use `search` to find a past campaign the user describes vaguely ('the invite one', 'that July newsletter') — it matches name and subject case-insensitively; try distinctive words from their description and broaden if no hits.
create_contact	Add a single new contact, optionally straight into audiences and/or with tags — e.g. 'add this person from my email into the newsletter list'. Contacts are subscribed by default. For more than a handful of people, use import_contacts instead.
search_contacts	Search contacts by email address or name. Returns matching contacts with their tags and subscription status.
list_contacts	List all contacts with optional filtering by subscription status and tag. Supports pagination.
import_contacts	Bulk import contacts from CSV data (min column: email), optionally straight into audiences and/or with tags. This is the tool for cross-app flows — e.g. pulling people out of Gmail, a CRM, or a spreadsheet and landing them in a Send16 audience in one call. Set updateExisting for upsert semantics (safe to re-run).
list_domains	List all sending domains configured in your Send16 workspace, including their verification status and DNS records.
check_domain_health	Check the DNS health of a specific domain, including DKIM, SPF, DMARC, and MX record verification status. Triggers a fresh DNS lookup.
get_campaign_stats	Get detailed performance statistics for a specific campaign including open rate, click rate, bounce rate, and delivery metrics.
get_deliverability_status	Get your workspace's deliverability summary — sending reputation, domain authentication status, and recent bounce/complaint health. (Deliverability Hub plan feature.)
list_automations	List all automations in the workspace, including draft/active/paused status and trigger types.
get_automation	Get a single automation by ID, including its trigger, steps, and current status.
enroll_in_automation	Manually enroll a contact in an active automation. The automation must be in 'active' status. Use send_event for event-driven enrollment.
send_event	Fire a custom event for a contact. Automations whose trigger is `{type:'custom_event', eventName:'<name>'}` will enroll the contact and start running. Payload is exposed to condition steps as `event.<key>`.
list_templates	List starter-gallery email templates available to every workspace.
get_template	Get a single starter template by ID, including its EmailContent JSON.
render_email_content	Compile an EmailContent JSON object (the shape used by the Send16 builder + templates) into HTML using the platform's authoritative renderer. Returns the exact HTML the API would send. Useful for previews and post-processing.
add_domain	Register a new sending domain. Returns the DNS records the user must add to their DNS provider, after which they should call check_domain_health to verify.
pre_send_review	Run an AI pre-send review on an email's HTML before sending. Surfaces tone issues, broken links, missing alt text, spam triggers, and accessibility problems.
generate_email_from_url	Scrape a URL (e.g. a launch blog post or product page) and generate an email draft from its content. Returns subject, preview text, and HTML body.
list_messages	List messages from the unified send log (transactional + campaign). Filter by recipient, sender, status, date range, or source.
get_message	Fetch a single message with its full event timeline (created → sent → delivered → opened → clicked → ...).
get_message_events	Get just the delivery event timeline for a message — no body or recipient details.
list_convos	List inbox conversations. Filter by state, mailbox, label, screener status, or full-text search. Send16's unified inbox combines transactional reply threading with team-managed shared inboxes.
get_convo	Get a single conversation with its full thread of posts (incoming + outgoing).
send_reply	Reply to an inbox conversation. The reply is sent from the original recipient address (the alias the convo arrived on) and threaded back to the contact.
mark_convo_read	Mark a conversation as read for the current viewer.
update_convo	Update conversation status (open/closed/archived/snoozed) or assignee.
add_convo_note	Add a private internal note on a conversation. Notes are visible only to workspace members.
screener_decide	Decide a pending screener conversation (first-time sender). 'allow' lets future emails through, 'reject' blocks, 'cold' marks as cold outreach.
list_inbox_counts	Get unread/total counts per category and label for the inbox sidebar (newsletter, transactional, marketing, calendar, social, cold).
list_topics	List subscription topics. Topics are granular categories contacts can subscribe to (e.g. 'product-updates', 'weekly-digest'). Campaigns and automations can be gated to subscribers of a specific topic.
create_topic	Create a new subscription topic. Contacts opt into topics individually via the preference center.
update_topic	Update a subscription topic (name, description, default).
delete_topic	Delete a subscription topic. All subscribers will be detached.
list_actions	List Actions. Actions fire a transactional template when a custom event arrives — Plunk-style 'event_name → template' pairings, simpler than full automations.
get_action	Get a single Action with its trigger config and template binding.
create_action	Create an Action that maps an event name to a transactional template. Each matching event sends one email to the contact.
update_action	Update an Action (toggle enabled, change template, change event name).
delete_action	Delete an Action.
list_audiences	List audiences (lists). An audience is a static, manually-managed group of contacts.
create_audience	Create a new audience.
add_contacts_to_audience	Add contacts (by ID) to an audience.
remove_contact_from_audience	Remove a contact from an audience.
delete_audience	Delete an audience (list). Contacts are not deleted — only the list and its memberships are removed.
list_segments	List dynamic segments. Segments compute their members from a filter expression at send time.
preview_segment	Preview the contacts that match a segment without sending.
update_contact	Update a contact's profile fields, custom fields, or subscription state.
delete_contact	Delete a contact and all associated events. Irreversible.
get_contact_timeline	Get a contact's full activity timeline: emails received, events fired, opens, clicks, automation enrollments, topic changes.
get_contact_health_score	Get a contact's 0-100 health score based on recent engagement (opens, clicks, replies).
send_broadcast	One-shot broadcast: create a campaign and immediately schedule it to send, in a single call. Pass either an audienceId, segmentId, topicId, or fully-qualified filter. Provide html OR templateSlug.
schedule_campaign	Schedule (or send immediately) an existing draft campaign to an audience/segment/topic.
update_campaign	Update a draft campaign: name, subject, preview text, sender info, HTML content, and/or recipients. Retarget with exactly ONE of audienceIds / segmentId / contactIds / tagIds / sendToAll, then verify with preview_campaign_recipients before sending. Only drafts can be edited.
pause_campaign	Pause a sending campaign. Already-sent messages are unaffected; remaining sends halt.
resume_campaign	Resume a paused campaign.
duplicate_campaign	Duplicate a campaign (template, content, and settings) as a new draft — works on sent campaigns too, so this is the way to re-use a past campaign's design. Optionally rename and retarget in the same call (exactly ONE of audienceIds / segmentId / contactIds / tagIds / sendToAll). NOTE: without retargeting, the copy keeps the ORIGINAL campaign's recipients.
delete_campaign	Delete a draft campaign. Sent campaigns cannot be deleted (only archived).
preview_campaign_recipients	Preview the recipient set for a campaign before sending. Returns count + sample list.
activate_automation	Activate an automation. New events matching its triggers will start enrolling contacts.
pause_automation	Pause an automation. Existing enrollments freeze in place; no new contacts enroll.
get_automation_stats	Get aggregate analytics for an automation: total enrollments, completed, exited, open/click rates per step.
list_automation_enrollments	List active and historical enrollments for an automation.
list_workspaces	List workspaces the authenticated user has access to (owner or member).
get_workspace	Get the current workspace (the one the API key belongs to).
get_brand	Get the workspace's brand settings: colors, logo, fonts, and the DESIGN.md spec injected into AI generation prompts.
update_brand	Update workspace brand settings. The designSpec field is a Markdown DESIGN.md document fed into AI generation system prompts — use it to encode voice, do/don't lists, and visual rules.
get_workspace_usage	Get the current month's send count, contact count, and plan limits.
list_suppressions	List suppressed email addresses (bounces, complaints, unsubscribes, manual).
add_suppression	Add an email to the suppression list. Future sends to this address will be blocked.
remove_suppression	Remove an email from the suppression list. Use only when you've confirmed the recipient wants to receive mail again.
list_webhooks	List configured outgoing webhooks (your endpoints that Send16 POSTs delivery events to). Outgoing webhooks are a plan feature.
create_webhook	Register an outgoing webhook endpoint. Send16 POSTs event JSON to this URL with an HMAC-SHA256 signature. Outgoing webhooks are a plan feature.
delete_webhook	Delete an outgoing webhook endpoint.
regenerate_webhook_secret	Rotate the HMAC signing secret for an outgoing webhook endpoint. Returns the new secret once.