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What do you want PostStack and Resend to do together?
Ask the assistant
Connect your AI client
Give your AI client this address.
https://mcp.apiant.aiAny 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)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 PostStack can start in Resend
When Contact Updated (instant) in PostStack
then Create Contact in Resend
When New Contact (instant) in PostStack
then Add Contact to Segment in Resend
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 PostStack and Resend
Triggers and actions 7 triggers · 59 actions
Trigger
Contact Deleted (instant)Fires when a contact is deleted (event: contact.deleted).
Trigger
Contact Updated (instant)Fires when a contact is updated (event: contact.updated).
Trigger
Email Bounced (instant)Fires when an email bounces (event: email.bounced).
Trigger
Email Delivered (instant)Fires when an email is delivered (event: email.delivered).
Trigger
New Contact (instant)Fires when a contact is created (event: contact.created).
Trigger
New Inbound EmailPolls for newly received inbound emails.
Trigger
New Sent Email (instant)Fires when an email is sent (event: email.sent).
Action
Add a broadcastCreate a new marketing broadcast.
Action
Add a contactCreate a new contact.
Action
Add a segmentCreate a new manual contact segment.
Action
Add a templateCreate a new email template.
Action
Add contacts to segmentAdd contacts to an existing segment.
Action
Add suppressionAdd an address to the suppression list.
Action
Cancel broadcastCancel an in-flight broadcast.
Action
Cancel emailCancel a scheduled or queued email before it sends.
Action
Delete a contactDelete a contact.
Action
Delete a templateDelete an email template.
Action
Get a contactFetch one contact by ID.
Action
Get a templateFetch one email template by ID.
Action
Get broadcastRetrieve one broadcast by its public id, including the HTML and text bodies that the list endpoint omits.
Action
Get emailFetch one sent or queued email by ID.
Action
Get email eventsGet the delivery event timeline for one email.
Action
Get inbound emailFetch one received inbound email by ID.
Action
Import contactsBulk-import a CSV list of contacts.
Action
List broadcastsList marketing broadcasts.
Action
List contactsList contacts in the account.
Action
List emailsList sent, queued, and scheduled emails.
Action
List inbound emailsList emails received via inbound parsing.
Action
List segmentsList contact segments.
Action
List suppressed addressesList addresses on the suppression list.
Action
List templatesList email templates.
Action
Send an emailSend a transactional email through PostStack.
Action
Send broadcastStart sending a broadcast to its recipients.
Action
Send emails in batchSend up to 100 emails in a single request.
Action
Update a contactUpdate an existing contact's fields.
Action
Update a templateUpdate an email template, creating a new version.
Action
Update emailReschedule a queued email's send time.
Action
Validate email addressCheck whether an email address is valid and deliverable.
Action
Add Contact to SegmentAdds a contact to a Resend segment. You can identify the contact by its ID or email address.
Action
Add SuppressionAdds an email address to your Resend suppression list so no further mail is sent to it.
Action
Cancel EmailCancels a scheduled Resend email that has not been sent yet.
Action
Create API KeyCreates a new Resend API key. The key itself is returned once, so store it right away.
Action
Create ContactCreates a contact in Resend. Returns the new contact's ID.
Action
Create DomainAdds a sending domain to Resend. Returns the DNS records you need to add at your domain host to verify it.
Action
Create SegmentCreates a new segment in Resend for grouping contacts.
Action
Delete API KeyDeletes a Resend API key so it can no longer be used.
Action
Delete ContactDeletes a contact from Resend. You can identify the contact by its ID or email address.
Action
Delete DomainRemoves a sending domain from Resend.
Action
Delete SegmentDeletes a segment from Resend. The contacts themselves are not deleted.
Action
List API KeysReturns the API keys on your Resend account, with each key's name and when it was last used. The key values themselves are never returned.
Action
List ContactsReturns the contacts in your Resend account, optionally limited to one segment.
Action
List DomainsReturns the sending domains on your Resend account and each one's verification status.
Action
List SegmentsReturns the contact segments in your Resend account.
Action
List Sent EmailsReturns the emails you have sent through Resend, newest first, with each email's id, sender, recipients, subject, send time and latest delivery event. Supports paging before or after a given email id.
Action
List SuppressionsReturns the email addresses on your Resend suppression list, showing for each one the address, why it was suppressed (bounce, complaint or added manually), the email that triggered it and when it was added.
Action
Remove Contact From SegmentRemoves a contact from one of your Resend segments. Identify the contact by its ID or by its email address, and name the segment to take it out of. The contact itself is not deleted.
Action
Remove SuppressionTakes an email address off your Resend suppression list so you can send to it again. Identify it by the suppression ID or by the email address itself.
Action
Retrieve ContactReturns one contact from your Resend audience, including their name, email address, whether they have unsubscribed, when they were added, and any custom properties stored on them. Look the contact up by its ID or by its email address.
Action
Retrieve DomainReturns one of your Resend sending domains, including its name, verification status, sending region, tracking settings and the DNS records it needs with each record's current status.
Action
Retrieve SegmentReturns one of your Resend segments by its ID, with the segment's name and when it was created.
Action
Retrieve Sent EmailReturns one email you sent through Resend, with its sender, recipients, subject, HTML and text body, tags, send time and latest delivery event.
Action
Send Batch EmailsSends up to 100 emails through Resend in a single call. Give it a list of emails, each with a sender, recipients, subject and body, and it returns the id of every email it created.
Action
Send EmailSends an email through Resend. Set the sender, recipients and subject, provide an HTML or plain text body, and optionally add CC/BCC, reply-to, attachments, tags or a send time.
Action
Update ContactUpdates a contact in your Resend audience. Identify the contact by ID or email address, then change the name, the subscribed/unsubscribed state, or the custom properties. Anything you leave blank stays as it is.
Action
Update EmailReschedules an email you already queued in Resend, moving it to a new send date and time. Only emails that have not gone out yet can be changed.
Action
Verify DomainAsks Resend to re-check the DNS records for one of your sending domains and start verifying it. Verification runs in the background, so the domain shows as pending until it finishes.
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
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Questions
PostStack and Resend, answered
What can start an automation from PostStack?
Any of PostStack's 7 triggers in the catalog, including Contact Updated (instant), New Contact (instant), New Inbound Email and New Sent Email (instant). Describe the moment in plain language and your agent picks the right one.
What can your agent do in Resend when something happens in PostStack?
Any of Resend's 28 actions, including Create API Key, Create Contact, Create Domain and Create Segment. Your agent maps the data both ways and tests every scenario before it ships.
Can it also run from Resend to PostStack?
Resend has no triggers in the catalog today, so automations start in PostStack. If you need the other direction, ask: your agent reads Resend's API documentation and adds it.
Do I have to build a connector for PostStack or Resend?
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.
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.