@type t() :: %Spatio.Model.SendEmailRequest{
  accountId: String.t() | nil,
  attachments: [Spatio.Model.AttachmentInput.t()] | nil,
  bcc: [String.t()] | nil,
  body: String.t(),
  cc: [String.t()] | nil,
  html: boolean() | nil,
  inReplyTo: String.t() | nil,
  references: [String.t()] | nil,
  subject: String.t(),
  to: [String.t()]
}