Usage - Overview of how Slap works

A new email thread in your connected mailbox will generate a new page in your connected Notion database.
A reply sent or received in an existing email thread is added to the dedicated Notion page, either in the comment section or directly in the page body, depending on your “How emails appear in Notion” setting. Learn more about the two modes here.
Any comment added to a page of your connected Notion database will send an email to the email address(es) listed in your email property, unless it starts with an #.
You can also start a new email conversation directly from Notion by manually creating a page in your connected database and filling in the email address property. Then, add a comment and its content will be sent to the email address you entered.