Subject: Resignation notice - [your name] - effective [last day]
Hello [manager name],
My last day at [company name] will be [last day].
I am grateful for the opportunity to work as a [your role] on the team and wish everyone the best moving forward. In the meantime, I am happy to ensure a smooth handoff and knowledge transfer process with the team. Please don't hesistate to reach out to me with any questions.