To allow email replies to reopen closed conversations, go to Settings > Channels > Email > Advanced and toggle off "Create new conversations when customers reply to closed conversations".
If you'd prefer email replies to closed conversations to create a new conversation in the Inbox, toggle this setting on then set when this should happen e.g. after 5 days.
This setting is specifically for email replies and can be configured differently to how replies through the Messenger behave.
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