Mark a Salesforce account as do not contact when a prospect opts out

When a reply is labeled Do not contact or Unsubscribe, a webhook tells n8n to set the suppression fields on the Salesforce person and account, so the opt-out holds across every team.

CRM sync

Salesforce

n8nRevOpsRevenue plan

When

Add LabelDo not contact or Unsubscribe

Then

Send a webhookSend the email, domain and label to n8n, which updates the Salesforce suppression fields

Why teams run it

Respects opt-outs at the account level in the CRM, not just in one mailbox.

Set it up in Master Inbox

In Master Inbox, open Settings, then Workflows, and click Add a workflow.
Name it Mark a Salesforce account as do not contact when a prospect opts out.
Set the trigger to Add Label and choose Do not contact or Unsubscribe.
Add the action Send a webhook: Send the email, domain and label to n8n, which updates the Salesforce suppression fields.
Save the workflow and switch it to Active.

Or create it with the API

Everything in the workflow builder is also in the Master Inbox API. This request creates the same workflow. Replace the example ids with your own label, list and campaign ids from GET /workflows/filter-fields.

curl -X POST https://api.masterinbox.com/api/api-webhook/v1/api/workflows/create-workflow \
  -H "Authorization: Bearer $MASTER_INBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "name": "Mark a Salesforce account as do not contact when a prospect opts out",
  "trigger_type": "add_label",
  "trigger_config": {
    "label_ids": [
      176479
    ]
  },
  "action_configs": [
    {
      "action_type": "webhook",
      "webhook_url": "https://hooks.example.com/master-inbox",
      "webhook_payload_variables": [
        "name",
        "email",
        "company_name",
        "label_names",
        "thread_url",
        "text"
      ]
    }
  ]
}'

Full reference: workflow API guide and API docs.

Or ask Claude, ChatGPT or Grok to build it

Our workflow guide is written for AI agents to read. Give your assistant your API key and this prompt:

Read https://app.masterinbox.com/public-workflow-api.md and use my Master Inbox API key to create this workflow: "Mark a Salesforce account as do not contact when a prospect opts out". First call GET /workflows/filter-fields and look up my label, list and channel ids, then create the workflow and tell me what you set up.

Questions

Can I set a re-contact date for Not now replies?

Yes. Run a second workflow on the Not now label and have n8n write a re-contact date instead of a suppression flag.

Does it also stop the sequencer?

Add Smartlead, Instantly or EmailBison actions to the same workflow to remove the lead there as well.

Can I build this workflow through the API?

Yes. Send the create-workflow request shown on this page with your Master Inbox API key. The API checks the payload first and lists every problem by field if anything is off.

Which plan includes this?

This workflow works on the Revenue plan. Every plan has unlimited users and starts with a free 7-day POC.