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PATCH
/
api
/
v1
/
emails
/
{emailId}
/
blocks
Update Email Blocks
curl --request PATCH \
  --url https://api.sequenzy.com/api/v1/emails/{emailId}/blocks \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "html": "<string>",
  "blocks": [
    {}
  ],
  "blockId": "<string>",
  "type": "<string>",
  "content": "<string>"
}
'
{
  "success": true,
  "email": {
    "id": "email_123",
    "companyId": "company_123",
    "name": "Welcome",
    "subject": "Welcome",
    "previewText": null,
    "blocks": [{ "id": "legacy-block", "type": "html", "content": "<table>...</table>" }],
    "createdAt": "2026-04-19T12:00:00.000Z",
    "updatedAt": "2026-04-19T12:05:00.000Z"
  }
}

​
Update Email Blocks

You can replace an email body with raw HTML or structured blocks. You can also mutate an existing block between text and html.

​
Request

​
emailId
string
required
Email ID.
​
html
string
Raw HTML body. Replaces all blocks with a native HTML body.
​
blocks
array
Structured email blocks. Replaces all existing blocks.
​
blockId
string
Existing block ID to mutate.
​
type
string
New block type. Type mutation supports text and html.
​
content
string
Optional replacement content for the mutated block.
curl -X PATCH "https://api.sequenzy.com/api/v1/emails/email_123/blocks" \
  -H "Authorization: Bearer API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"blockId":"legacy-block","type":"html"}'

​
Responses

{
  "success": true,
  "email": {
    "id": "email_123",
    "companyId": "company_123",
    "name": "Welcome",
    "subject": "Welcome",
    "previewText": null,
    "blocks": [{ "id": "legacy-block", "type": "html", "content": "<table>...</table>" }],
    "createdAt": "2026-04-19T12:00:00.000Z",
    "updatedAt": "2026-04-19T12:05:00.000Z"
  }
}