Case Study: Mailchimp Scales Reliable Email Delivery with Bird’s PowerMTA

How Mailchimp Scales Reliably with PowerMTA™

MailChimp, a large email service provider with over 5 million users and more than 15 billion emails delivered per month, needed a way to scale email sending reliably and cost-effectively as its customer base grew. The company turned to Bird (formerly MessageBird), using PowerMTA™ to support high-volume email delivery while maintaining performance and reliability.

Bird’s PowerMTA™ solution helped MailChimp manage efficient injection rates, bounce categorization, and VirtualMTA utilization across multiple MTA boxes and IPs. The result was a highly reliable sending infrastructure that could handle peaks of 2.5 million emails in an hour and more than 15 million emails per hour on high-volume days, while keeping queues stable and operations manageable.

MailChimp