• by Ray Schultz , February 6, 2019

Mailchimp’s engineering team has restored Mandrill’s operations after an outage that started over the weekend.

In an email to users, Mandrill Support says the features should be working for most customers, but there may be some residual effects. Among them: "Stats and metrics that should have been tracked during the outage may be incorrect or missing entirely."

In an earlier email, the company said resolving the issue could take “several days or longer.”

Mandrill is an email delivery API that facilitates the sending of transactional emails.

Since Sunday, the engineering team has “made code changes to work around the damaged database to preserve as much functionality for as many users as possible,” Mailchimp continues. “We added machines, storage, and networking to attempt a variety of efforts at preserving all data and getting back online.”

However, the company decided “that our efforts to preserve all data would take too much time. We changed direction to truncate specific tables in order to get back online faster. These efforts were successful.”

It adds: “We determined that some data was preventing necessary automatic processes from running. We deleted that data, which allowed those processes to successfully run and return the database to a usable state.” 

Mailchimp is now conducting a “full post-event review.” 

“We sincerely apologize for this outage and the impact to your business,” Mailchimp says. “We’re committed to compensating our customers for the disruption this outage has caused.” 

The email goes on: “Once we’ve fully resolved all issues, we’ll let you know more about how and when we plan to issue refunds or credits. You don’t need to take any action at this time.”