Douglas Karr's Articles on Martech Zone
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Mailtrap: The Smarter Way to Test and Ship Emails at Scale
Modern engineering and product teams face relentless pressure to ship features quickly without sacrificing reliability or user trust. Few areas expose that tension more than email. From onboarding flows and password resets to promotional campaigns and transactional alerts, email must…
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Beware of the SaaS Contact Pricing Penalty
The modern Software as a Service (SaaS) landscape is built on a deceptively simple revenue model: charge customers based on the number of contacts stored in the system. Whether you’re working with an email service provider, CRM, customer data platform,…
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How Accurate is Digital Geographic Location Data?
Businesses often make strategic decisions based on where they believe their customers are. Whether it’s tailoring campaigns, triggering localized experiences, segmenting audiences, or attributing conversions, location is treated as a solid data point. Yet for both B2B and B2C marketers,…
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When WordPress Redirects Become a Server-Killing Vulnerability
I’ve spent years optimizing WordPress sites, tuning MySQL, standing up server configurations, and chasing down performance bottlenecks. But nothing prepared me for the discovery I made when my own server began melting under relentless CPU load over the last month.…





