Agent Mail Messages

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Blocks for sending, receiving, replying to, forwarding, and managing email messages via AgentMail. Messages are individual emails within conversation threads.

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Agent Mail Forward Message

What it is

Forward an email message to one or more recipients. Supports CC/BCC and optional extra text or subject override.

How it works

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The block validates that the combined recipient count across to, cc, and bcc does not exceed 50, then calls the AgentMail API to forward a specific message from your inbox. You provide the inbox ID and message ID to identify the original email, along with the target email addresses. Optionally, you can override the subject line or prepend additional plain text or HTML content before the forwarded message body.

The API handles constructing the forwarded email with the original content included. Any errors from the API propagate directly to the global error handler without being caught by the block.

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Inputs

Input	Description	Type	Required
inbox_id	Inbox ID or email address to forward from	str	Yes
message_id	Message ID to forward	str	Yes
to	Recipient email addresses to forward the message to (e.g. ['[email protected]'])	List[str]	Yes
cc	CC recipient email addresses	List[str]	No
bcc	BCC recipient email addresses (hidden from other recipients)	List[str]	No
subject	Override the subject line (defaults to 'Fwd: <original subject>')	str	No
text	Additional plain text to prepend before the forwarded content	str	No
html	Additional HTML to prepend before the forwarded content	str	No

Outputs

Output	Description	Type
error	Error message if the operation failed	str
message_id	Unique identifier of the forwarded message	str
thread_id	Thread ID of the forward	str
result	Complete forwarded message object with all metadata	Dict[str, Any]

Possible use case

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• Escalation Routing — Forward messages that match certain keywords or priority levels to a human supervisor's email for review.
• Multi-Agent Collaboration — Forward incoming requests to a specialized agent's inbox so the right agent handles each task.
• Digest Distribution — Forward summarized daily reports from an aggregation inbox to a distribution list of stakeholders.

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Agent Mail Get Message

What it is

Retrieve a specific email message by ID. Includes extracted_text for clean reply content without quoted history.

How it works

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The block fetches a single message from an AgentMail inbox by calling the API with the inbox ID and message ID. It returns the full message content including subject, plain text body, HTML body, and all metadata.

A key output is extracted_text, which contains only the new reply content with quoted history stripped out. This is especially useful when feeding message content into an LLM, since it avoids processing redundant quoted text from earlier in the conversation.

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Inputs

Input	Description	Type	Required
inbox_id	Inbox ID or email address the message belongs to	str	Yes
message_id	Message ID to retrieve (e.g. '[email protected]')	str	Yes

Outputs

Output	Description	Type
error	Error message if the operation failed	str
message_id	Unique identifier of the message	str
thread_id	Thread this message belongs to	str
subject	Email subject line	str
text	Full plain text body (may include quoted reply history)	str
extracted_text	Just the new reply content with quoted history stripped. Best for AI processing.	str
html	HTML body of the email	str
result	Complete message object with all fields including sender, recipients, attachments, labels	Dict[str, Any]

Possible use case

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• Intent Classification — Retrieve a message and pass its extracted text to an LLM to classify the sender's intent before routing to the appropriate workflow.
• Conversation Context Loading — Fetch a specific message to build context for generating a relevant reply in a multi-turn email conversation.
• Attachment Processing — Retrieve a message's full metadata to extract attachment URLs for downstream processing like document parsing or image analysis.

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Agent Mail List Messages

What it is

List messages in an AgentMail inbox. Filter by labels to find unread, campaign-tagged, or categorized messages.

How it works

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The block queries the AgentMail API to retrieve a paginated list of messages from the specified inbox. You can control the page size with limit (1-100) and navigate through results using the page_token returned from a previous call. An optional labels filter returns only messages that have all of the specified labels.

The block outputs the list of message objects, a count of messages returned in the current page, and a next_page_token for fetching subsequent pages. When next_page_token is empty, there are no more results.

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Inputs

Input	Description	Type	Required
inbox_id	Inbox ID or email address to list messages from	str	Yes
limit	Maximum number of messages to return per page (1-100)	int	No
page_token	Token from a previous response to fetch the next page	str	No
labels	Only return messages with ALL of these labels (e.g. ['unread'] or ['q4-campaign', 'follow-up'])	List[str]	No

Outputs

Output	Description	Type
error	Error message if the operation failed	str
messages	List of message objects with subject, sender, text, html, labels, etc.	List[Dict[str, Any]]
count	Number of messages returned	int
next_page_token	Token for the next page. Empty if no more results.	str

Possible use case

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• Inbox Polling — Periodically list messages labeled "unread" to trigger automated processing workflows for new incoming emails.
• Campaign Monitoring — Filter messages by campaign-specific labels to track reply rates and engagement across an outreach sequence.
• Batch Processing — Page through all messages in an inbox to perform bulk operations like summarization, archiving, or data extraction.

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Agent Mail Reply To Message

What it is

Reply to an existing email in the same conversation thread. Use for multi-turn agent conversations.

How it works

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The block sends a reply to an existing message by calling the AgentMail API with the inbox ID, the message ID being replied to, and the reply body text. An optional HTML body can be provided for rich formatting. The API automatically threads the reply into the same conversation as the original message.

The block returns the new reply's message ID, the thread ID it was added to, and the complete message object. This makes it straightforward to build multi-turn email conversations where an agent responds to incoming messages within the same thread.

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Inputs

Input	Description	Type	Required
inbox_id	Inbox ID or email address to send the reply from	str	Yes
message_id	Message ID to reply to (e.g. '[email protected]')	str	Yes
text	Plain text body of the reply	str	Yes
html	Rich HTML body of the reply	str	No

Outputs

Output	Description	Type
error	Error message if the operation failed	str
message_id	Unique identifier of the reply message	str
thread_id	Thread ID the reply was added to	str
result	Complete reply message object with all metadata	Dict[str, Any]

Possible use case

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• Customer Support Agent — Automatically reply to incoming support emails with answers generated by an LLM based on the message content and a knowledge base.
• Interview Scheduling — Reply to candidate emails with proposed interview times after checking calendar availability through another block.
• Conversational Workflow — Maintain an ongoing back-and-forth conversation with a user, where each reply builds on the previous exchange to complete a multi-step task.

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Agent Mail Send Message

What it is

Send a new email from an AgentMail inbox. Creates a new conversation thread. Supports HTML, CC/BCC, and labels.

How it works

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The block first validates that the combined count of to, cc, and bcc recipients does not exceed 50. It then calls the AgentMail API to send a new message from the specified inbox, creating a new conversation thread. You must provide at least a plain text body; an optional HTML body can be included for rich formatting.

The block supports CC and BCC recipients for human-in-the-loop oversight or silent monitoring, and labels for tagging outgoing messages for later filtering. The API returns the new message's ID, the thread ID for tracking future replies, and the complete message object.

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Inputs

Input	Description	Type	Required
inbox_id	Inbox ID or email address to send from (e.g. '[email protected]')	str	Yes
to	Recipient email addresses (e.g. ['[email protected]'])	List[str]	Yes
subject	Email subject line	str	Yes
text	Plain text body of the email. Always provide this as a fallback for email clients that don't render HTML.	str	Yes
html	Rich HTML body of the email. Embed CSS in a <style> tag for best compatibility across email clients.	str	No
cc	CC recipient email addresses for human-in-the-loop oversight	List[str]	No
bcc	BCC recipient email addresses (hidden from other recipients)	List[str]	No
labels	Labels to tag the message for filtering and state management (e.g. ['outreach', 'q4-campaign'])	List[str]	No

Outputs

Output	Description	Type
error	Error message if the operation failed	str
message_id	Unique identifier of the sent message	str
thread_id	Thread ID grouping this message and any future replies	str
result	Complete sent message object with all metadata	Dict[str, Any]

Possible use case

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• Outreach Campaigns — Send personalized cold emails to a list of prospects with campaign labels for tracking, using HTML templates for professional formatting.
• Alert Notifications — Send automated alert emails when a monitored metric crosses a threshold, CC-ing a human operator for oversight.
• Report Delivery — Generate and send periodic summary reports to stakeholders with BCC to an archive inbox for record-keeping.

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Agent Mail Update Message

What it is

Add or remove labels on an email message. Use for read/unread tracking, campaign tagging, or state management.

How it works

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The block calls the AgentMail API to modify the labels on a specific message. You can add new labels, remove existing ones, or do both in a single call. Labels are arbitrary strings you define, making them flexible for tracking message state such as read/unread, processing status, or campaign membership.

The block returns the updated message ID and the complete message object reflecting the current label state. This is useful as a downstream step after processing a message, allowing you to mark it as handled so it is not picked up again by a polling workflow.

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Inputs

Input	Description	Type	Required
inbox_id	Inbox ID or email address the message belongs to	str	Yes
message_id	Message ID to update labels on	str	Yes
add_labels	Labels to add (e.g. ['read', 'processed', 'high-priority'])	List[str]	No
remove_labels	Labels to remove (e.g. ['unread', 'pending'])	List[str]	No

Outputs

Output	Description	Type
error	Error message if the operation failed	str
message_id	The updated message ID	str
result	Complete updated message object with current labels	Dict[str, Any]

Possible use case

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• Read/Unread Tracking — Remove the "unread" label and add "read" after an agent processes a message, preventing duplicate processing on the next polling cycle.
• Pipeline State Management — Add labels like "sentiment-analyzed" or "response-drafted" as a message moves through multi-step processing, so each stage knows which messages still need work.
• Priority Tagging — Add a "high-priority" label to messages from VIP senders or containing urgent keywords, enabling downstream blocks to filter and handle them first.

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