AgentMail Create Draft

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

Creates an email draft in a specified AgentMail inbox, with optional scheduling, recipients, attachments, and labels

Price / callFree

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How this service works

Create Draft

Output

Returns a Draft object containing the draft_id, inbox_id, to/cc/bcc/reply_to addresses, subject, HTML and plain-text body, labels, preview text, send_at schedule time, references to prior thread messages, client_id, and created_at/updated_at timestamps.

Example use cases

Prepare templated customer response drafts

“Create a draft email in my support inbox to customers who haven't responded in 30 days. Use a friendly follow-up template with our logo, CC my manager, and tag it as 'follow-up' so I can batch review them before sending.”

Schedule bulk outreach emails for campaigns

“Draft 5 personalized emails to our webinar attendees in the 'outreach' inbox with different names filled in, add our event PDF as an attachment, and schedule them all to send next Monday morning at 8am.”

Create threaded email responses for review

“In my support inbox, draft a reply to that customer's complaint message with an apology and resolution offer, CC the customer success team, and mark it as 'urgent' so someone can review it before we send it out.”

Technical details

Endpoint

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

When to prefer

Use this endpoint when an AI agent needs to compose and save an email for later review or scheduled delivery, rather than sending immediately. Ideal when the agent wants to prepare outgoing emails with rich content (HTML, attachments, labels) that may need human review before sending, or when precise scheduled delivery is required.

Side effects

Invalid inbox_id returns 404 not found
Missing or invalid Authorization Bearer token returns 401 unauthorized
Malformed recipient email addresses return 422 validation error
Invalid send_at datetime format returns 422 validation error
Attachment content that is not valid base64 returns 422 validation error
inbox_id path parameter missing causes 400 or 404 error

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.
labels	array	Labels 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>`.
client_id	string	Client ID of draft.
attachments	array	Attachments to include in draft.
in_reply_to	string	ID of message being replied to.

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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