AgentMail Update Draft

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AgentMail Update Draft is a free API for AI agents from AgentMail at mpp.api.agentmail.to, Free, status unknown (last checked 2026-10-11).

Updates an existing email draft in an AgentMail inbox, allowing modifications to recipients, subject, body, scheduling, and other fields

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How this service works

Update Draft

Output

Returns the full updated Draft object including draft_id, inbox_id, to, cc, bcc, subject, html, text, reply_to, labels, preview, send_at, client_id, references, created_at, and updated_at timestamps.

Example use cases

Example prompt

“Update my draft 'draft_abc123' in inbox 'inbox_xyz456' on AgentMail — change the subject to 'Meeting Follow-Up', update the body text to 'Hi, just following up on our meeting. Let me know your thoughts.', and schedule it to send at 2025-06-01T09:00:00Z.”

Technical details

Endpoint

PATCHhttps://mpp.api.agentmail.to/v0/inboxes/:inbox_id/drafts/:draft_id?utm_source=zero.xyz

When to prefer

Use this endpoint when an AI agent needs to revise an already-created email draft before sending — such as updating recipient lists, changing subject or body content, or adjusting a scheduled send time. Prefer this over creating a new draft when an existing draft_id is known and only partial fields need modification.

Side effects

404 if inbox_id or draft_id does not exist
401 if Bearer token is missing or invalid
400 if request body fields are malformed (e.g. invalid email address format or invalid date-time for send_at)
422 if required path parameters inbox_id or draft_id are not provided
409 if draft has already been sent and cannot be modified

Input

Schema · Request body

Field	Type	Description
cc	array	Addresses of CC recipients. In format `username@domain.com` or `Display Name <username@domain.com>`.
to	array	Addresses of recipients. In format `username@domain.com` or `Display Name <username@domain.com>`.
bcc	array	Addresses of BCC recipients. In format `username@domain.com` or `Display Name <username@domain.com>`.
html	string	HTML body of draft.
text	string	Plain text body of draft.
send_at	string	Time at which to schedule send draft.
subject	string	Subject of draft.
reply_to	array	Reply-to addresses. In format `username@domain.com` or `Display Name <username@domain.com>`.

Output

Schema · Response

Field	Type	Description
cc	array	Addresses of CC recipients. In format `username@domain.com` or `Display Name <username@domain.com>`.
to	array	Addresses of recipients. In format `username@domain.com` or `Display Name <username@domain.com>`.
bcc	array	Addresses of BCC recipients. In format `username@domain.com` or `Display Name <username@domain.com>`.
html	string	HTML body of draft.
text	string	Plain text body of draft.
labelsrequired	array	Labels of draft.
preview	string	Text preview of draft.
send_at	string	Time at which to schedule send draft.
subject	string	Subject of draft.
draft_idrequired	string	ID of draft.
inbox_idrequired	string	The ID of the inbox.
reply_to	array	Reply-to addresses. In format `username@domain.com` or `Display Name <username@domain.com>`.
client_id	string	Client ID of draft.
created_atrequired	string	Time at which draft was created.
references	array	IDs of previous messages in thread.
updated_atrequired	string	Time at which draft was last updated.
attachments	array	Attachments in draft.
in_reply_to	string	ID of message being replied to.
send_status	string	Schedule send status of draft.

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