What makes Sendgrid better than most other SMTP relays? Reporting, price and their great customer service. Obviously we could all run our own server and use Postfix or MS exchange but then we have to deal with the black art of actually not getting our emails shoved into a spam folder. With sendgrid we are given the tools to successfully deliver emails and can avoid most of the tricks that you would have to employ otherise. Prices is insanely low when compared to other similar services. One really good feature is their email reputation score, everytime you log in you can see where you are at and what is hurting you... open rates, etc. This is critical in developing any type of email newsletter or direct campaign. Their customer service is also great, they will actually return emails and you can do a live chat with them that does provide help (as opposed to most live chat that is out there). Great service especially for the price.