First-timer resigning: Email vs. Face-to-face

I received an offer from another company and will be resigning from my first official job. Need advice on what is the resignation norm here in Singapore. I'm wondering if it's ok to send an email telling my manager I'm resigning with my resignation letter attached, or if that is totally rude and I should be arranging a meeting with my manager instead to tell them face-to-face.

I'd definitely phrase the email very courteously, so tone is not (or less of) a factor here and delivery method is the main question. Thanks!