How are email conversations threaded in Reply?

Reply automatically groups replies from the same email conversation into a single thread, so you can see the full conversation history in one place.

When someone replies to an existing email, the new message is added to that conversation rather than creating a new one. Attachments, previous replies, and quoted email content are also kept within the conversation.

If someone sends a new email instead of replying to an existing conversation, Reply creates a new conversation.