After the demise of Mandrill I started to divide transactional email between Elastic Email and SparkPost. I send around a thousand messages a month through them and haven't had any problems with either. I still miss Mandrill though. I send high volume mail through Mailgun and have had a great experience with them and their API. I tried integrating with Sendgrid but they have some constraints around MX records that were showstoppers for me.

Thanks. SparkPost mention they have the best deliverability in the market.

How would you rate the deliverability out of 100% for Elastic Email and SparkPost?

Thanks