Advertising & Marketing · Postgrid + Claude
Postgrid MCP with Claude: Automate Direct Mail and Address Checks
The short answer
Claude works with Postgrid through the Model Context Protocol (MCP), an open standard that acts as a secure adapter between the two. Once connected with an API key, Claude can verify addresses, prepare letters and postcards, and manage direct mail campaigns from natural language instructions, while the organisation controls what it is allowed to do and approves sending.
What is Postgrid?
Postgrid is an API platform for automating direct mail and address verification. Businesses use it to send letters and postcards to customers without manual printing, envelope handling or postage work, and to check that mailing addresses are valid before anything is sent. It is typically used by marketing teams, finance departments, customer service operations and any organisation that relies on physical correspondence alongside digital channels. Because it runs through an API, it can be connected to other business systems rather than used only by hand.
How Claude connects to Postgrid through MCP
The Model Context Protocol is an open standard that lets Claude securely use other software, reading information and taking actions, with permissions the organisation controls. Think of it as a universal adapter between Claude and the tool. For Postgrid, the connection is made using the API key the organisation provides.
Once connected, Claude can typically look up and verify addresses, draft and prepare letters or postcards, check the status of mail campaigns and report on what has been sent. A team member could ask, in plain English, for every lapsed customer in a list to receive a reactivation postcard, and Claude would prepare the job for review.
Permissions and approvals keep people in charge. Access is limited to what each workflow needs, so Claude can be allowed to verify addresses while sending requires sign-off. Every action can be logged for audit, and consequential steps such as dispatching a mail run can be set to wait for a named approver before they happen.
What you can automate
Verifying customer addresses at sign-up
When a new customer enters an address in a web form or CRM, Claude can check it against Postgrid's verification service before the record is saved. Typical results include flagging incomplete or undeliverable addresses for correction. This reduces returned post, wasted postage and the manual effort of fixing records later.
Automating postcard campaigns
Marketing teams can describe a campaign in plain language, such as a welcome postcard for new members in a given region. Claude prepares the recipient list, checks addresses and drafts the postcard for review. Once approved, the mail run is scheduled, and the team receives a summary of what was queued.
Sending transactional letters
Some notices must still go by post, such as renewal reminders, policy updates or statements for customers without digital access. Claude can pick up these requests from a ticketing or billing system, generate the letter from approved templates and route it for dispatch, cutting the time staff spend on routine correspondence.
Cleaning mailing lists
Over time, mailing databases collect errors and out-of-date addresses. Claude can run a batch verification across a list, summarise the results by category and suggest which records need attention. Staff review the suggested corrections before any changes are written back, keeping data quality under human control.
Tracking campaign performance
Operations managers often want to know what was sent, to whom and when. Claude can retrieve campaign status and delivery information through the connection and present it as a short weekly summary, helping leaders see progress without logging into several screens.
An end-to-end workflow: New member welcome letters with address checks
TriggerA new member completes registration in the membership system and opts in to receive physical post.
The membership system passes the new member's details to Claude.
Claude verifies the postal address through Postgrid and flags any corrections needed.
Verified members are added to a welcome letter batch using the approved template.
The batch is placed in an approval queue, where the membership manager reviews a summary and signs off.
Once approved, Claude schedules the mail run and records each dispatch in the CRM against the member's profile.
OutcomeWelcome letters reach members at correct addresses on the first attempt, with fewer returned items and a full record of each mailing kept in the CRM. Results vary by organisation and mailing volume.
How we set it up
Free automation audit
We review how your team currently handles mail and address data, and identify the workflows most worth automating with Postgrid and Claude. You receive a clear recommendation at no cost.
Secure connection
We connect Claude to Postgrid using the API key your organisation provides, stored securely and limited to the permissions each workflow requires. No shared or personal credentials are used.
Workflow design
We design the end-to-end process across Postgrid and your other systems, such as your CRM, ticketing tool or Microsoft 365, and agree with you which actions need human approval.
Testing and launch
We test the workflow against real past cases, check results with your team, and launch with monitoring and audit logs turned on so every action can be traced.
Team training
We train your staff on how to make requests, review approvals and read the logs, and provide written guidance so the workflow can be run confidently after handover.
Who benefits
- Marketing managers
- Launch and adjust postcard and letter campaigns in plain language, without waiting on manual print and dispatch steps.
- Operations leaders
- Reduce time spent on routine correspondence and get regular summaries of mail activity across the business.
- IT and data teams
- Keep address data clean with batch verification, with least-privilege access and full audit trails.
- Finance and customer service heads
- Ensure statements and notices reach customers accurately, with fewer returns and less rework.
Security and control
- Access uses an API key with the narrowest permissions each workflow needs, and keys are stored securely and can be rotated.
- Consequential actions such as dispatching mail are routed to a named human approver before they take effect.
- Audit logs record what Claude requested, what was approved and what was sent, supporting internal review.
- Personal data is handled only as needed for each workflow and in line with your own data protection policies.
- We test workflows against real cases before launch and monitor them afterwards to catch errors early.
For teams in the US, UK, India and the Middle East
Organisations in the United States and the United Kingdom can have their workflows designed to meet their state-level and UK GDPR requirements. In India, we design around the Digital Personal Data Protection Act, 2023. For organisations in the UAE and Saudi Arabia, we align with local data protection laws. Claude can be hosted in India, the United States, the United Kingdom or the European Union, and the hosting region is chosen to meet your requirements.
Learn more about Claude and MCP
Anthropic's AI model and assistant.
Secure links between Claude and business tools.
How engineers build and change software with Claude.
Hosted agents that run multi-step work.
The open standard Claude uses to connect to tools.
Frequently asked questions
What does the Postgrid MCP server do?
The Postgrid MCP server acts as a secure bridge between Claude and your Postgrid account. It lets Claude use Postgrid's functions, such as verifying addresses and preparing mail, in response to plain-language requests. The server only does what the connected permissions allow, and it does not give Claude access beyond the workflow you agree on.
Is connecting Postgrid to Claude secure?
Security depends on how the connection is set up. We use an API key with the narrowest permissions each workflow needs, store it securely and make sure sending actions require human approval. Audit logs record activity, so your team can see what was requested and what was sent. We help you review these controls before launch.
What can Claude actually do with Postgrid?
Typically, Claude can verify addresses, prepare letters and postcards from approved templates, manage campaign lists, check mail status and summarise results. Exactly what is possible depends on the features available in your Postgrid account and the permissions you grant during setup.
How long does setup take?
Timing depends on the number of workflows and the systems involved. A single, well-defined workflow such as address verification at sign-up is often set up in a short period, while a multi-system campaign process takes longer because it needs testing and training. We confirm a timeline after the free automation audit.
Which plan or permissions do I need?
You need an active Postgrid account and an API key with permissions suited to the workflows you plan to automate. The exact plan requirements depend on the features and volumes you use, so we check your current account during the audit and advise on any changes needed before connecting Claude.