I have gone from Mandrill to Sendgrid and back to Mandrill. Personally, we had tons of issues with Sendgrid (too many blacklisted IPs, emails being delivered la

I have gone from Mandrill to Sendgrid and back to Mandrill. Personally, we had tons of issues with Sendgrid (too many blacklisted IPs, emails being delivered late etc) but Mandrill has been rock solid.