Applies To: ■ PoliteMail Desktop ■ PoliteMail Online ■ PoliteMail O365
Version: □ 4.94 □ 4.97 ■ 5.0+
According to Microsoft, adaptive or actionable cards must be sent to an individual and not a group. In addition, the recipient must have an account with Outlook.com or Exchange Online. Since a shared mailbox is treated as a group, Adaptive Cards are not currently supported for a shared mailbox.
See this link for more information.