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View email conversations in Mail on Mac
By default, Mail groups together email messages that are part of the same “conversation” (or thread), instead of listing each reply individually. Conversations make it easier to follow a thread and help streamline your Inbox.

Tip: It’s easy to turn conversations on or off. In Mail, choose View > Organize by Conversation (a checkmark shows it’s on).
Show all of the emails in a conversation
In the Mail app
on your Mac, do one of the following:
For one conversation: Click the message count in the top message.
For all conversations: Choose View > Expand