We were made aware of a problem where emails may continue to send the following days after their initial delivery when SMTP is enabled.
The Kaseya R&D Team has Identified the source of the issue and is currently reviewing next steps for resolution.
In the meantime, our Support team has been supplied with a workaround and can assist you with implementing it. If you would like to have the workaround applied, please create a ticket with our Support team via email at support@connectbooster.com or contact them at 877-733-6584.