sendMail shall raise an error if template variables are missing
we realized that the sendMail API has a problem. For instance if you are using a template that has 5 variables and your sendMail call includes just 4 values. Then sendMail yields SUCCESS but the mail will be listed as BLOCKED due to an error in the template later on (can be seen in the Mailjet stats). It would be cool if the sendMail function would return an error directly!