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You can send messages, reply to conversations, and forward emails from your inboxes through the API. All sent messages are tracked within threads alongside received messages, giving you a complete view of each conversation.
Your domain must have sending capability enabled to send messages from inboxes. See add a sending domain to configure your domain.

Send a new message

Send a new email from an inbox. This creates a new thread for the conversation.

Send request fields

Each address is an object with address (required) and name (optional) fields.

Reply to a message

Reply to a received message. The reply is added to the same thread and automatically sets the In-Reply-To header to link the conversation.

Reply request fields

Reply all

When you set replyAll to true, the reply is sent to the original sender and all recipients from the original message. Your own inbox address is automatically excluded from the recipient list.

Forward a message

Forward an existing message to new recipients. This creates a new thread for the forwarded conversation.

Forward request fields

Response fields

All send, reply, and forward operations return the same response structure:

Next steps

Threads

View the full conversation history in threads

Receiving events

Get notified when messages are sent from your inboxes