Marketing Automation at Scale: Customer.io + Mailgun
When Customer.io, an automated messaging platform, ran into scaling issues with their Email Service Provider (ESP), it felt like they were trying to run a race car on vegetable oil. They knew they were never going to be able to fuel their rapidly growing company if they couldn’t find an ESP with more horsepower. Luckily, they found Mailgun, an ESP that could keep up with their explosive growth. When the technical teams at Customer.io and Mailgun came together, they built a platform capable of supporting senders with dozens of domains that needed to send millions of emails a day. We sat down with John Alison, co-founder of Customer.io, to unpack what the journey to this solution looked like.