For 15+ years I've built, fixed and scaled the systems companies rely on to reach the inbox. Deliverability is where I'm known best, but my work runs the whole length of the sending stack: the lifecycle programs that decide what gets sent, the automation and integrations that power them, and the migrations that move them, without losing the reputation you've earned.
I'm most useful where email isn't a side feature but something the business depends on, and where landing in spam carries a real cost.
Product, transactional and lifecycle email that has to reach users (password resets, onboarding, notifications) at growing volume.
Promotional and automated sending that has to survive the 2024 sender rules and keep hitting the inbox as lists grow.
Platforms and marketplaces sending millions of messages a month, where reputation, isolation and monitoring are the whole game.
Deliverability is the foundation, but reaching the inbox is only useful when the right message is being sent, from a system that holds up. I work across the whole picture.
The work I'm known for: getting mail into the inbox and keeping it there. Authentication (SPF, DKIM, DMARC), sender reputation, blacklist recovery, and clean bounce and complaint handling.
Designing the programs that decide what actually gets sent (onboarding, activation, retention and win-back), so the right message reaches the right person at the right moment, not just more email.
Standing up the sending stack end to end: ESP onboarding (Amazon SES, SendGrid, Mailgun), separated transactional and marketing lanes, feedback loops, and the integrations that connect it all to your product.
Moving between providers, platforms or domains without torching reputation: staged warm-up, authentication carried across cleanly, and traffic shifted in a controlled ramp.
Bringing machine learning and LLMs to email problems (anti-phishing, abuse detection and reply analysis), from years spent protecting large sending platforms.
Leveling up your team on deliverability, authentication and list hygiene through practical workshops, so good email practice becomes part of how you build.
Reputation in this field isn't a certificate: it's being in the rooms where the rules get set and the hard problems get solved.
I take part in M3AAWG, the Messaging, Malware and Mobile Anti-Abuse Working Group, where mailbox providers, ESPs and anti-abuse teams shape the standards the whole email ecosystem follows. Being in that room, repeatedly, keeps my work aligned with where deliverability is actually heading, not last year's blog posts.
Presented on DMARC at Inbox Expo, the international email deliverability conference.
Wrote the ten-chapter deliverability guide on this site, and contributed to or reviewed industry ebooks with Woodpecker and UpLead.
Led deliverability at GetResponse and Woodpecker, platforms other companies send through, not just advised from the outside.
From founding companies to leading deliverability at the platforms other people send through.
2025–Present
Blazalek.com · Email Expert Agency
Running Blazalek.com, a focused agency for email deliverability and lifecycle: audits, setup, migrations and ongoing oversight for teams whose business depends on reaching the inbox.
2021–2025
GetResponse
Led deliverability and ESP mail-flow at one of the largest email platforms in the region, where inbox placement is the product for hundreds of thousands of senders.
2015–2021
Woodpecker.co
Owned deliverability and the integration layer for a cold-outreach platform: designed the REST API, launched Zapier and Pipedrive integrations, and defined the SaaS metrics the team ran on.
2014–2015
W33 · WebDNA.io
Built WebDNA.io, a machine-learning spam-detection engine, later open-sourced. First-hand ownership of the models that decide what looks like abuse.
2008–2012
Feminet · We-Dwoje.pl
Grew one of Poland's largest women's portals, later acquired by Edipresse (today Polki.pl). Learned audience, retention and scale the hard way.
2005–2007
Money.pl
Early growth, analytics and conversion work at a major Polish portal, where the habit of measuring everything started.
A few projects that show the range: from AI on top of email to the plumbing underneath it. Figures are from the teams and platforms where the work ran.
An LLM-based classifier that raised phishing-detection accuracy for a large sending platform.
A reply-sentiment feature at Woodpecker adopted by the majority of active users.
An abuse-detection system at GetResponse that cut the platform's abuse rate substantially.
An integrations and email-delivery layer that opened the platform to 200+ third-party connections.
An onboarding redesign that cut time-to-value dramatically and lifted feature adoption.
A machine-learning spam-detection engine, built from scratch and released to the community.
“At GetResponse, Wojtek set a new standard of quality as Head of Email Deliverability. He has a unique combination of broad knowledge, strategic vision and hands-on technical skills, always striving to maximize email performance with a focus on deliverability and user experience.”
“He was always the go-to person when we needed to get to the root of deliverability issues for our clients. Deliverability was a complex and overwhelming topic for me, but Wojtek made it understandable and actionable. He explained not just what happened, but why, and how to fix it.”
“One of the most versatile, proactive, and deeply knowledgeable email professionals I've ever encountered. Many of us know him as a go-to expert in deliverability and compliance, but that barely scratches the surface. Wojtek consistently operates several steps ahead and solves problems most of us haven't even spotted yet.”
Case studies
A closer look at how I actually work through real projects, not pitches. Each one walks through the process rather than the private details, across very different kinds of senders.
SaaS payments & online selling · Designed toward ~1M sends/day
Newsletters now run on their own isolated infrastructure without ever touching the domains the business depends on; the team operates it themselves with monitoring and alerting.
Fintech lending marketplace
How I moved a high-volume lending marketplace onto a new event-driven sending engine and rolled it out safely, phase by phase.
Venue booking marketplace
I recovered a busy marketplace's damaged sender reputation and handed over the routines that keep its mail in the inbox.
“Reaching the inbox isn't a switch you flip. It's trust you earn: by proving your mail is really yours, and that people actually want it. My job is to make that provable, repeatable, and boring, so email quietly does its work while you grow.”
Wojtek Blazalek
You describe your situation, no prep and no technical vocabulary required.
I tell you honestly whether it's urgent, whether I'm the right person, and what I'd look at first.
You leave with a concrete next step, whether or not we end up working together.
Confidentiality. I work under NDA whenever you need it. Your sending domains, volumes, data and anything we discuss stay private. Nothing is published or shared without your say-so.
Helping SaaS and e-commerce teams reach the inbox: audits, setup, migrations and ongoing oversight.
Keeping the deliverability guide and FAQ on this site current, and sharing what actually moves inbox placement.
Staying close to M3AAWG and the DMARCbis rollout, so what I recommend matches where mailbox providers are heading.
Where I've shared what I know about deliverability and email, on stage, in print, and as a guest.
The Email Deliverability Guide
Blazalek.com · My own ten-chapter guide to email deliverability, free to read on this site.
DMARC Advisor
Inbox Expo · Speaker at the international email deliverability conference, presenting on DMARC as Head of Email Deliverability at GetResponse.
The Ultimate Cold Email Guide
UpLead · Invited expert contributor (representing Woodpecker.co), alongside names like Aaron Ross, Sujan Patel and lemlist's Guillaume Moubeche.
Deliverability 101
Woodpecker.co · Technical reviewer of Woodpecker's free, practical guide to email deliverability.
Deliverability talk at Woodpecker Meeting
Woodpecker.co · Prepared and delivered an in-house presentation on deliverability as Head of Integrations.
How to Maximize Email Deliverability for Better Outreach
LinkedIn · A self-authored three-part series on preparing a domain, warming it up and writing cold email that reaches the inbox.
3 European Early Stage Founders
Poach.vc · Profiled as a founder, former Head of Email Deliverability & AI, in the European founders newsletter.
Why company culture matters
Made in Wro · A talk on company culture given at the Made in Wro event in Wrocław.
It's not just business, it's a big part of our lives
Spider's Web · An interview about building We-Dwoje.pl into one of Poland's largest portals.
Delivery check
We'll walk through your symptoms and sending volume. You'll leave with a concrete hypothesis, a risk assessment and a plan for what's next. Whether or not we end up working together.
