We tried SES first, but despite doing all the required stuff (SPF, DKIM), our delivery was very poor, especially to corporate emails. Used Mandrill and it's bet

We tried SES first, but despite doing all the required stuff (SPF, DKIM), our delivery was very poor, especially to corporate emails. Used Mandrill and it's better now. Although, the biggest benefit we saw was switching to text-only emails. That improved delivery on several corporate networks. Delivery is an ongoing issue though.