address                 set address to sg_mail class
attachments             attachments
auth_check              Check API key for auth.
auth_set                Set API key for auth.
body                    body
dynamic_template        Add dynamic template
dynamic_template_data   Add dynamic template data
embed_rmd               Embeding Rmd on body with images.
from                    from
mail                    Set mail class for Sendgrid
print.sg_mail           Print for sg_mail class
send                    send mail
subject                 subject
template_id             template id
