/// <summary>
/// Sends a single transactional email using send API v3.1
/// </summary>
public static Task <TransactionalEmailResponse> SendTransactionalEmailAsync(
this MailjetClient mailjetClient,
TransactionalEmail transactionalEmail, bool isSandboxMode = false)
{
return(mailjetClient.SendTransactionalEmailsAsync(new[] { transactionalEmail }, isSandboxMode));
}