Send Reply to Thread - Learn WorkflowDog

The Send Reply to Thread action takes a Gmail thread ID, finds the most recent message in that thread carrying the INBOX label, and replies to it. Use it when your workflow tracks conversations rather than individual messages.

Inputs

Input	Type	Required	Description
Third-party account	Google account	Yes	Gmail account that sends the reply.
Thread ID	String	Yes	Gmail conversation ID.
Reply All	Boolean	No	Include original `To` and `CC` recipients except this account.
Body	String	Yes	Reply content.
Body Type	`Plain Text` or `HTML`	No	Body encoding. Defaults to Plain Text.
Attachments	List of files	No	Files to attach.

Outputs

Output	Type	Description
Reply Message ID	String	Gmail ID of the sent reply.

The target is the newest inbox message in the thread, not necessarily the newest message of any kind. A thread containing only sent messages cannot be used by this action.

Example: continue a stored conversation

Load the customer’s stored thread ID and connect it to Send Reply to Thread. After the reply is sent, store Reply Message ID if later actions need to refer to that specific message.

Troubleshooting

No messages found in thread

The thread must contain at least one message with Gmail’s INBOX label. Use Send Reply with a specific Message ID when you already know the message to answer.