Mailchimp Sends a Billion Emails a Day. That’s the Easy Part by Klint Finley from on 2016-07-15 23:45 (#1MFW4) Sending a massive number of emails isn't the problem that keeps the company's engineers busy all day. Making sure they're read, on the other hand ... . The post Mailchimp Sends a Billion Emails a Day. That's the Easy Part appeared first on WIRED.