I only tested SendGrid and Mandrill for transactional email. I switched off SendGrid after seeing quite a bit of gmail owners got their email sent into spam (b

I only tested SendGrid and Mandrill for transactional email. I switched off SendGrid after seeing quite a bit of gmail owners got their email sent into spam (but I believe they fixed the issue). I use DKIM/SPF with Mandrill and nobody mentioned a spam issue since then. On SES: I cannot find back the precise article I was thinking about right now (a benchmark if I remember well), these are just my memories.