MailheightBlog
Notes on getting into the inbox.
Deliverability and outreach notes: what moves inbox placement, reply rates, and sender reputation.
The Invisible Work Behind Email Deliverability: What Clients Don't See
Email deliverability may appear seamless, but it requires extensive behind-the-scenes work including DNS checks, authentication alignment, reputation monitoring, and content reviews. This article explores the invisible engineering that ensures campaigns land in the inbox.
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How AI Is Widening Email Security Gaps and What It Means for Cold Outreach
Proofpoint warns that AI is widening email security gaps at India's largest companies, making phishing more convincing and scalable. For cold outreach senders, this means stricter authentication and sender reputation are more critical than ever.
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Authentication Isn't Enough: Why Reputation and Behavior Matter for Email Security
Email authentication alone can't stop sophisticated threats. This article explains why reputation and behavior analysis are essential for modern email security and cold outreach success.
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What a Study of 1.52 Million Malicious Domains Teaches Us About Cold Email Deliverability
A longitudinal study of 1.52 million malicious domains offers surprising insights for cold email senders. Learn how domain reputation, authentication, and list hygiene directly impact inbox placement. As per published article in https://arxiv.org/pdf/2606.11111
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Why Founders Are Building Their Own ESPs: The WordPress Moment for Email
Founders are building their own email service providers (ESPs) out of necessity, not ego. With AI tools and cheap sending infrastructure, custom ESPs are becoming as normal as a WordPress site.
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Hidden Infrastructure Issues: The Silent Killer of Email Deliverability
Even with perfect authentication, a clean list, and a dedicated IP, emails can still land in spam. The culprit is often a hidden infrastructure issue that standard tools fail to detect.
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Bounce Reports Can Be Misleading Due to Enterprise Gateways
Enterprise email gateways like Proofpoint and Mimecast can cause valid email addresses to appear as bouncing. Learn how to read raw SMTP responses and avoid misleading bounce reports.
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Stop Email Deliverability Issues: Why Infrastructure Matters More Than Copy
Most email deliverability problems start with the infrastructure underneath your email, not the copy inside it. Learn how to audit your IP reputation and sending setup to land in the inbox.
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60% of Deliverability Issues Sit in Infrastructure, Not Authentication
Most cold emailers focus on SPF, DKIM, and DMARC, but the real culprit behind poor deliverability is often the sending infrastructure. This article explains why IP history matters more than authentication.
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Email Deliverability: Controlling Your Aircraft
Email deliverability is like flying an aircraft: your ESP is the plane, mailbox providers are air traffic control. Focus on what you can control to land in the inbox.
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