Every Channel that you create within Teams not only creates a folder within the Team document library on SharePoint, it also creates an email address. End users can send a message to the Channel email address and it will automatically be added as a conversation thread within Teams. Unfortunately, Teams automatically generates the email address and it cannot be changed. To find out what your channel email address is follow these steps:
Open your Teams app and navigate to the Team that the Channel is part of. Click the drop down to expand the channels if necessary.
Click the ellipsis next to the Channel then on Get email address.
Click copy and then save it somewhere you can easily access it, such as in your contacts.
By clicking on advanced settings you can change who has the ability to email the Channel address.