Inclusive language creates inclusive workplaces and, by sharing yours, it makes it easier for someone who is gender non-conforming to share their pronouns.
Gender pronouns are words that a person uses to describe themselves or would like others to describe them. For cisgender people, the common pronouns are she/her/hers or he/him/his. However, people who do not conform to the binary male/female categorisation may use they/them/theirs.
By including pronouns in your e-mail, you can help bring awareness and demonstrate inclusivity internally and externally and show consideration and respect that pronouns are an important part of gender identity.