Email Delivery Articles & Insights

DNS forward and reverse lookup flow diagram showing A record forward resolution and PTR record reverse resolution for email server verification

July 14, 2026 Technology

Reverse DNS (PTR Records) — Why They Matter for Email Delivery

Learn how reverse DNS and PTR records impact email deliverability. Essential technical guide for sysadmins covering rDNS setup, verification, common issues, and why mailbox providers check PTR records during SMTP connections.

Email security ROI analysis infographic showing security investment costs versus breach costs with ROI metrics in business blue and green

July 12, 2026 Business

Email Security ROI Analysis: Building the Business Case for Email Protection Investment

Comprehensive guide for CFOs and CISOs on calculating email security ROI, quantifying breach costs, and building compelling business cases for protection investment.

Email deliverability audit checklist showing SPF, DKIM, DMARC authentication checks, sender reputation monitoring, and inbox placement testing with dark blue cybersecurity aesthetic

July 10, 2026 Insights

Email Deliverability Audit — What to Check

A practical guide to conducting an email deliverability audit — covering authentication, sender reputation, list hygiene, content analysis, and infrastructure checks that keep your messages out of the spam folder.

Cybersecurity diagram showing subdomain email architecture with SPF, DKIM, and DMARC protection layers across domain hierarchy

July 10, 2026 Guides

Subdomain Email Security: Protecting Your Domain Hierarchy from Email-Based Attacks

Learn how to secure subdomains against email-based attacks with proper SPF, DMARC, and DKIM configuration. Essential guide for email administrators.

Three-column comparison showing developer-focused, marketer-focused, and enterprise-focused email service approaches side by side

July 9, 2026 Insights

SMTP2GO vs GetResponse vs SMTP.com — When to Use Which

A high-level comparison of SMTP2GO, GetResponse, and SMTP.com — three popular email services serving different use cases. Learn when to use each based on your role and sending requirements.

Technical visualization of DMARC forensic report structure showing report fields and analysis workflow for email authentication failure investigation

July 8, 2026 Guides

DMARC Forensic Reports: A Complete Guide to Email Authentication Failure Analysis

Learn how DMARC forensic reports provide real-time email authentication failure data for security analysts investigating spoofing and phishing threats.

MTA-STS and TLS-RPT protocol visualization showing encrypted email connections between mail servers with TLS enforcement and reporting

July 8, 2026 Insights

MTA-STS & TLS-RPT — The Protocols You’re Missing

Your emails are "encrypted in transit" — but standard TLS is opportunistic. MTA-STS enforces TLS connections while TLS-RPT provides visibility into failures. Here's why these protocols should be your next email security priority.

Multi-layered defense concept showing phishing emails being blocked at different security layers with AI detection, authentication checks, and human awareness as three defense tiers

July 7, 2026 Insights

Phishing Attacks Are Getting Smarter — But So Should Your Defenses

Phishing attacks in 2026 are powered by AI and bypassing legacy filters. Learn the three defense layers every organization needs: email authentication, employee training, and advanced threat detection.

Diagram showing MTA-STS encryption flow between sending and receiving mail servers with DNS TXT record lookup, HTTPS policy file fetch, and enforced TLS connection

July 7, 2026 Guides

MTA-STS and TLS-RPT — The Email Security Protocols You’re Probably Missing

MTA-STS and TLS-RPT close critical gaps in email encryption. Learn how these protocols prevent TLS downgrade attacks and provide visibility into delivery security.

Email security incident response workflow diagram showing detection, containment, investigation, remediation, and recovery phases with blue, green, and orange alert colors

July 6, 2026 Guides

Email Security Incident Response: A Comprehensive Guide for Security Teams

Master email security incident response with this comprehensive guide covering detection, containment, investigation, and recovery strategies for security teams.