High Importance flag for emails

Is there a possibility to set the importance of emails sent via alarming pipelines?

Thanks for your answers in advance,
Best Regards

Not via the notification block itself. system.net.sendEmail does have a priority parameter you can provide, if you want to go down the route of constructing your own notification. Acknowledgement would be a complication if you went that route. Also, there's no guarantee your SMTP server and email client of choice respects the X-Priority header.