Integration
Connect Mattermost and Lettr
When New Channel fires in Mattermost, your agent runs Add contact in Lettr, or New email event in Lettr to Post Message in Mattermost. Describe the whole flow and it is built, tested on every scenario and kept running.
What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it.
Build solutions, not workarounds.
What do you want Mattermost and Lettr to do together?
Ask the assistant
Connect your AI client
Give your AI client this address.
https://mcp.apiant.aiOne 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.aiStart Claude Code there, approve the server, and sign in in the browser page it opens.
Claude Code guide (opens in a new tab)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)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)Zed
Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server.
Setup guide (opens in a new tab)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)Grok
Open grok.com/connectors, choose New Connector, then Custom, and paste the address. Grok signs you in in your browser.
Setup guide (opens in a new tab)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)Example flows
What Mattermost and Lettr can do together
From Mattermost to Lettr
When New Channel in Mattermost
then Add contact in Lettr
From Lettr to Mattermost
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 Mattermost and Lettr
Triggers and actions 3 triggers · 49 actions
- New Channel
Triggers when a new public channel is created in a Mattermost team.
- New user
Triggers when a new user joins the selected Mattermost team.
- Add direct channel
Creates (or returns the existing) direct message channel between two users.
- Add Reaction
Adds an emoji reaction to a Mattermost post.
- Add user
Creates a new user account on the Mattermost server and returns the created user.
- Add User to Channel
Adds a user to a Mattermost channel.
- Add user to team
Adds a user to a team, making them a team member.
- Create Channel
Creates a public or private channel in a Mattermost team.
- Delete channel
Deletes (archives) a Mattermost channel, or permanently deletes it when requested.
- Delete Post
Deletes a Mattermost post.
- Delete reaction
Removes a user's emoji reaction from a post.
- Find channels by name
Searches a team's public channels (and channels you belong to) whose name or display name matches a search term, and returns the matching channels.
- Find posts by terms
Searches the posts in a team for the given search terms and returns the matching posts.
- Find User by Email
Finds a Mattermost user by email address.
- Find user by username
Finds a Mattermost user by their username and returns the user's profile.
- Get channel
Returns a Mattermost channel's details (name, display name, team, type, purpose and header) by its channel ID.
- Get Post
Returns a single Mattermost post by its ID.
- Get team
Returns a Mattermost team by its ID.
- Get user
Returns a Mattermost user's profile by their user ID.
- List channels
Returns the public channels on a Mattermost team.
- List posts
Returns the most recent posts in a Mattermost channel, newest first, optionally limited to posts changed since a time or before/after a given post.
- List Teams
Returns the Mattermost teams you belong to.
- List users
Returns users on the Mattermost server, optionally limited to a team, channel or group, or filtered by role and active status.
- Pin post
Pins a post to the channel it was posted in.
- Post Message
Posts a new message to a Mattermost channel, optionally as a reply in a thread.
- Remove user from channel
Removes a user from a channel.
- Update channel
Updates a channel's name, display name, purpose, header or other settings. Only the fields you fill in are changed.
- Update Post
Changes the text of an existing Mattermost post.
- New email event
Triggers instantly when Lettr reports an email event, such as a delivery, bounce, open, click, spam complaint or unsubscribe.
- Add audience list
Creates a new audience list in Lettr with the given name and returns the created list.
- Add contact
Adds a new contact to your Lettr audience, optionally placing it on a list, setting custom properties, and sending a double opt-in confirmation email.
- Add contact to list
Adds an existing contact to one of your audience lists. Succeeds whether the contact was newly added or was already on the list.
- Add template
Creates a new email template in Lettr from HTML or Topol editor JSON content, and publishes its first version with the merge tags found in the content.
- Create campaign
Creates a draft email campaign in Lettr with its subject, sender, content and audience, ready to send or schedule.
- Delete contact
Permanently deletes a contact from your Lettr audience.
- Get campaign
Returns one Lettr campaign with its settings, audience, status and delivery stats.
- Get contact
Returns a single audience contact, including its subscription status, custom properties, lists and topics.
- Get email
Returns a sent email's details — sender, subject, recipients, delivery state — and all of its delivery, bounce, open and click events.
- Get template
Returns a single email template by its slug, including its HTML, editor content, purpose, status and version details.
- List audience lists
Returns all audience lists in your Lettr team, with each list's name and contact count.
- List campaigns
Returns the email campaigns in your Lettr account, optionally only those with a given status.
- List contacts
Returns the contacts in your Lettr audience, optionally narrowed by a search term, subscription status, list or segment.
- List domains
Returns every sending domain registered in your Lettr account, with its approval status, whether it can send, and its DNS verification state.
- List emails
Returns emails sent from your Lettr account in the last few days, optionally filtered by recipient address and date range.
- List templates
Returns the email templates in a Lettr project, optionally limited to one folder or to transactional or campaign templates.
- Schedule campaign
Schedules a Lettr campaign to send at a future time, or moves an already scheduled campaign to a new time.
- Schedule email
Schedules a transactional email for delivery at a future time (at least 5 minutes ahead and within 30 days), using your own content or a saved template.
- Send campaign
Sends a draft Lettr campaign to its audience right away. The campaign needs a subject, a sender on a verified domain, and content.
- Send Email
Sends a transactional email through Lettr to one or more recipients, using your own HTML/text content or a saved template.
- Send Email Template
Sends an email using one of your saved Lettr templates, filling its merge variables with the values you provide. Returns the send's request ID and how many recipients were accepted.
- Unschedule campaign
Cancels a scheduled Lettr campaign send and returns the campaign to draft.
- Update contact
Updates an existing contact in your Lettr audience, changing its email address, subscription status or custom properties. Fields left blank are not changed.
No trigger or action matches that. Ask your agent to add it: it reads the API documentation and builds what you describe.
Each app on its own
Reviews
What our customers say
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Questions
Mattermost and Lettr, answered
What can start an automation from Mattermost?
Any of Mattermost's 2 triggers in the catalog, including New Channel and New user. Describe the moment in plain language and your agent picks the right one.
What can your agent do in Lettr when something happens in Mattermost?
Any of Lettr's 23 actions, including Create campaign, Send campaign, Send Email and Send Email Template. Your agent maps the data both ways and tests every scenario before it ships.
Can it also run from Lettr to Mattermost?
Yes. When something happens in Lettr, your agent can act in Mattermost too. This page covers both directions: Lettr's triggers and Mattermost's actions are listed here as well.
Do I have to build a connector for Mattermost or Lettr?
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 Mattermost and Lettr 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.