Breaker
Newsletter SoftwareHow Breaker scaled from 10K to 10M emails per month with SendPost
A newsletter software company needed reliable infrastructure and IP control. Here's how SendPost helped them build mailstreams ready for scale across 10+ B2B brands.
Challenge
What started as managed services quickly evolved into software and marketing automation as Breaker sought to scale unique processes developed in the field. To scale their offering for B2B newsletters, they had to own the tech stack and build mailstreams for their customers that were ready for scale and growth.
Results
Starting from a base of roughly 10,000 emails per week during onboarding and warmup, Breaker scaled to processing between 5 and 10 million emails per month — roughly a 250x increase in volume, with full IP control and per-brand isolation throughout.
About Breaker
The Challenge
Scaling a multi-brand newsletter operation meant owning every part of the mailstream.
What started as managed services quickly evolved into software and marketing automation as Breaker sought to scale unique processes developed in the field. To scale their offering for B2B newsletters, they had to own the tech stack and build mailstreams for their customers that were ready for scale and growth.
Control over IPs
It was mission critical for Breaker to control each part of the mailstream — IPs, domains, throttling — and to have visibility into inboxing and engagement on a per-inbox-provider basis.
Multi-brand complexity
Each brand had different sending profiles, volumes, and reputations. Breaker needed a way to manage them independently.
Rising costs
The combination of tools they were previously using to stitch together a sending stack was becoming expensive relative to the control they were getting.
The Solution
Dedicated IP control, per-brand infrastructure, and managed warmup on SendPost.
Dedicated IP management
Breaker was given control of 25+ dedicated IPs, letting them isolate sending reputation per brand and per client. A deliverability issue with one brand no longer put the entire operation at risk.
Multi-brand infrastructure
Each brand could be configured with its own sending profile, domains, and warmup cadence, all managed from one place.
Hands-on deliverability support
Breaker got a dedicated Slack channel with direct access to SendPost's deliverability team, including engineers and senior leadership, plus pre-scheduled check-in calls for ongoing strategy.
Managed IP warmup
Instead of manually warming IPs with spreadsheets and guesswork, SendPost handled the warmup process systematically, getting new IPs ready for production volume without damaging reputation.
The Results
From 10,000 emails a week to 10 million a month
The impact was immediate and sustained. Breaker built their initial product on SendPost as their core email infrastructure, which gave them the visibility and control they needed. Their private beta quickly scaled to six figures in ARR and millions of sends per month.
Scaled through onboarding and warmup without damaging reputation.
A deliverability issue with one brand no longer put the entire operation at risk.
Domains, warmup cadence, and throttling all managed from one place.
Engagement held up as volume scaled.
Why SendPost
What you can't see is what you need to see
Breaker needed complete visibility into the performance of each sender in every inbox — to see which account may be hurting reputation and which may be best supporting the product for all customers. SendPost is built for exactly this reality, surfacing the things other platforms abstract away. Because when you're managing email for multiple brands, what you can't see is what you need to see.
"SendPost provided the right tools and exceptional customer support for us to build the right tools for our publishers."
— Ben, Founder, Breaker
Ready to Reach the Inbox, Every Time?
Join thousands of developers and businesses who trust SendPost's powerful API and infrastructure to deliver their most important emails.
