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.
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Send an email to a channel
Go to the channel name and click More options > Get email address.
FYI, this feature needs to be enabled by your IT admin.
Reply to an email in a channel
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.
View the original email
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.
Troubleshoot email failures
There are a few reasons why sending an email to a channel can fail:
The feature is not enabled by your IT admin.
The channel settings restrict who can send email.
The email contains more than 50 inline images.
The email has more than 20 file attachments.
The SharePoint folder associated with the channel has been deleted or renamed.
You can read, reply to, and view an original email in a channel on your mobile device. To get a channel's email address, though, you need to go to the desktop or web app.