We dearly regret having started with Sendgrid. The UX is extremely unintuitive and simple actions are just not avaible. The customer service does respond quickly, but in many cases it just ends up in long winding discussions why things are what they are i.e. no good! What does work surprisingly well is the account upgrade procedure, because for every little addition expect to pay more. I give it one star for the friendly customer support, but if it wasn't for the fact that they pulled us in already, I'd be happy to leave, cause it's been a struggle from day one. Unfortunately not recommended.