1Standard resignation (full notice)
The default: proper notice, neutral-to-good relationship.
Subject
Resignation - [Your name]
Body
Dear [Manager's name], I am writing to formally resign from my position as [role] at [Company]. In line with my [notice period] notice, my final working day will be [date]. This was not a quick decision - I am moving on to [as much as you want to share: "a new opportunity" is plenty] - and I want the transition to be as smooth as I can make it. Over the coming weeks I will document my responsibilities, hand over [key areas/projects], and help bring whoever takes this on up to speed. Thank you for [something true and specific: the trust with X, the flexibility during Y, what you learned]. I am glad to have been part of [team/Company]. Please let me know the practical next steps. Kind regards, [Your name] [Date]