Your customers are moving through the world in real time, and Customer.io now shows up with them: on the lock screen, in the real world, through the channels they actually use. Here's what shipped 🧵

By migrating our petabyte-scale MySQL fleet to Google Cloud Hyperdisk, we doubled peak disk throughput while cutting block storage costs in half. Eliminating doublewrite not only has improved our peak disk throughput, we observed improvements in our foreground flush latency as well. Read the full article to learn how: customer.io/learn/how-we-wor…

Excited to partner with you!

A haunted house, but it's just another new messaging channel

A haunted house, but it's just "thought leaders" saying email marketing is dead

A haunted house, but it's just an email list that hasn't opted in

A haunted house, but it's just UNSUBSCRIBE in all caps

Thanks for the shout, Thibaut Davoult! We're honored that you're digging the way we've integrated AI into our workflow.

UNSUBSCRIBE! We asked marketers at Drive by @exitfivemedia what they're unsubscribing from vs. what they'll stay loyal to forever.

See you soon, Stockholm! Our team will be at MadTech 2026 on October 7th. Make sure to attend our session with Matt Lane, Manager, Account Management here at Customer.io, and Richard Meurlin, Head of Growth Marketing at Nordnet Bank AB. They'll share what it takes to turn AI-powered personalization into meaningful, lasting engagement.

Cheers to Hispanic Heritage Month 🍸 Last Friday, we hosted a virtual mixology class with the team where we made margaritas, caipirinhas, and palomas!

"Who wrote this?!" - Dave Gerhardt We set out to build the worst email ever and shared it with Dave to gauge his reaction. To achieve this, we played Mad Libs with marketers we met at Drive by Exit Five. How did we do? Have you seen a worse email?

Anyone leaving Dreamforce still has time to wave at our billboard on your way to the SFO airport 👀

See you at DMEXCO, digital marketers! We'll be in Hall 6.1 at Booth E015 answering all your customer messaging questions. Who will we see in Germany next week?

You heard it here first, folks. Tell your Agent what you want to achieve. It will build, analyze, and optimize in one conversation. AI that does the work, not just the talking.

Reddit AMA tomorrow: email deliverability, spam filters, and why your sender reputation matters. 11am-1pm ET on r/OfficialCustomerio. Brad Gurley runs deliverability at Customer.io. He'll answer your questions about getting into inboxes, authentication, segmentation, ISP reputation, or whatever you want to know.

Forever retweet 🥰

Happy Hispanic Heritage Month! Our Sazón & Soul community invited the team to take part in a piñata making class on Friday to help celebrate. Plus, we ate some tasty Mexican candies like Pulparindo and Vero Elotes. What's your team doing to celebrate Hispanic Heritage Month?

The tech industry pulled back on junior engineers. We gave them an office. This fall, five University of Waterloo co-op students are joining our Engineering org for a 16-week term. They'll work out of a physical office in downtown Toronto. Why are we doing this? Because they're the future. "We want to invest in the next generation of software engineers," says Engineering Manager Marcel Van Der Linde. "A lot of companies have pulled back on early-career hiring. We think that's shortsighted." "It's also a bet that pays off both ways. The next generation of engineering students have been AI-native since their first year of school. They almost certainly think about and approach their work differently than many of us who have been in the industry for decades already. We're hoping to learn from them, too." Instead of having the co-op students do sideline work, they'll be embedded directly onto one of our squads: In-App, Messaging Channels, Workflows, Content, and Audiences. They'll focus on tangible, valuable, customer-facing roadmap work alongside the rest of their team. We're also flying engineers and leaders into the Toronto office throughout the term. Over the 16 weeks, the co-ops will work alongside dozens of people from across the company and gain direct access to leadership and customers. To top it all off, each student will wrap up their term with a presentation directly to the CEO. We'll be sharing their stories here over the next few months so keep an eye out!

Had an absolute blast seeing Harry Styles together in NYC 🎵 Next stops on our Listen More tour include Tame Impala in Portland, Jungles in Boston, and Tame Impala (again!) in Dallas. Marketers, you're gonna want to snag your spot. Check out all our upcoming events: customer.io/events

Need a break from email marketing? Go play Flappy Mail, a cute lil game built right into Customer.io. Think you can beat us? (Spoiler: You probably can.)