Customers master a server's supported possibilities by using the EHLO greeting, as exemplified underneath, in lieu of the first HELO. Clients tumble back again to HELO only if the server does not support EHLO greeting.[24] SendGrid is the go-to option for users planning to generate and send transactional emails. https://israelcamyj.blog5star.com/27122343/an-unbiased-view-of-ssl-certificate