If you want to send an email to a channel in Teams, use the channel email address. Once an email is part of a channel, anyone can reply to it to start a conversation.
Go to the channel name and click More options > Get email address.
When you reply to an email message in a thread, it creates a conversation about the email within Teams. However, this does not send an email reply to the original sender. Any comments or conversations you have about the email in a channel aren't visible outside of Teams.
Sometimes, emails that get sent to a channel are too large to view in the conversation. To see an email in its original format, click View original email under the email in the conversation.
You can share chats or channel conversations to Outlook—without leaving Teams.
From within Teams, you can share a copy of a chat as an email to Outlook.
In Teams, you can also share an entire channel conversation as an email to Outlook.