Which pronouns suit you?

It’s up to you.

Woman: she/her/hers
Sam feels more comfortable when she is addressed with female pronouns in her email communication. It makes her feel good.
Man: he/him/his
Sam feels more comfortable when he is addressed with male pronouns in his email communication. It makes him feel good.
Non-binary: they/them/theirs
Sam feels more comfortable when they are addressed with non-binary pronouns in their email communication. It makes them feel good.

Or a combination of all of the above.

Tips

Let others know which pronouns suit you.
You could include your pronouns in your email signature and add a link to this webpage.
Don’t blindly assume what people identify as based on their name or appearance: non-binary, (trans) man, (trans) woman …
Not sure whether to use they, he or she? ‘They’ is your safest option in that case. It’s both neutral and clear.
Above all, use ‘you’ where possible. This is much more personal.
Want to know more about gender-neutral language (a work in progress): https://lgbtlifecenter.org/pronouns/.

That way you help ensure that all genders feel respected.