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- 10 minutes read
Silent Email Failures: Why They’re Harder to Spot
Silent Email Failures: Why They’re Harder to Spot
Silent email failures generate no error alerts, making them hard to detect. Learn what to investigate when emails vanish without a trace.
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All blog articles
- 9 minutes read
BIMI for Brand Consistency in the Inbox
Learn how BIMI supports brand consistency in the inbox, what it requires to work, and how Sendmarc helps simplify BIMI readiness.
- 15 minutes read
SPF limit reached? Fix your DNS records
The SPF limit allows a maximum of 10 DNS lookups. Learn what causes SPF issues, ways to reduce lookups, and how to protect legitimate email delivery.
- 9 minutes read
How Phishing Simulations Strengthen Security
Learn how corporate phishing simulations help enterprises improve employee awareness, identify weak points, measure risk, and build better habits over time.
- 8 minutes read
Why Zero Trust Matters for Modern Businesses
Learn how Zero Trust reduces risk, why continuous verification matters, and how email authentication supports a stronger security strategy.
- 9 minutes read
Why p=reject still needs DMARC reporting
p=reject cuts spoofing, but vendor and platform changes can break alignment. Use DMARC reports and alerts to prevent critical email rejections.
- 11 minutes read
How to check email deliverability: Tools & tips
Learn how to check email deliverability with practical tools and tips. Review authentication, blocklists, bounces, and spam complaints.
- 15 minutes read
Gmail 550-5.7.26 error: Fix unauthenticated email
Learn what Gmail’s 550-5.7.26 “This Mail Is Unauthenticated” bounce means, what triggers it, and how to fix it with SPF, DKIM, and DMARC.
- 12 minutes read
How to read DMARC reports: Enterprise guidance
Learn how to read DMARC reports, understand what the data means, and reduce manual effort with a clearer, tool-led approach.
- 10 minutes read
Is it safe to open spam emails? Enterprise risks
Is it safe to open spam emails? Usually, yes. Risk escalates with links, attachments, and credential prompts – then containing outbound abuse quickly matters.
- 17 minutes read
Botnet attacks explained: How to reduce risk
A botnet is a network of infected devices used for spam, phishing, and malware. Learn how DMARC enforcement reduces spoofing that abuses your domain.
- 11 minutes read
Use proactive alerts to prevent DMARC failures
Proactive alerts flag DNS changes, new senders, and lookalike domains to prevent DMARC failures, keep critical email flowing, and safeguard users.
- 9 minutes read
PayPal email scam: How it worked before the fix
A recent PayPal email scam used real PayPal messages to show fake purchase details and a callback number. See how it worked.
- 9 minutes read
Reverse DNS mismatch: Fix SMTP banner errors
Fix “reverse DNS does not match SMTP banner” errors by aligning PTR, A records, and server identity to restore trust and reliable email delivery.
- 21 minutes read
Adopt DMARC without an in-house DNS expert
Learn how to adopt and enforce DMARC without an in-house DNS expert. Understand common SPF, DKIM, and DMARC pitfalls, and see how managed services reduce risk.
- 17 minutes read
Email-first cybersecurity predictions for 2026
Explore key cybersecurity predictions for 2026, from AI-powered phishing to DMARC enforcement, BIMI adoption, SPF and DKIM limits, Zero Trust, and automation.
- 21 minutes read
No DMARC record found: Fix this critical mistake
Seeing a “no DMARC record found” error for your domain? Learn what it means, how it exposes you to spoofing and BEC, and how to move safely to p=reject.
- 15 minutes read
TLS 1.2: Why it still matters for secure email
TLS 1.2 remains vital for secure communication. Learn why it’s still widely used, how it compares to TLS 1.3, and how to strengthen your TLS posture.
- 21 minutes read
BEC: Explaining Business Email Compromise
Learn what Business Email Compromise (BEC) is, how to spot common scams, respond to attacks, and use SPF, DKIM, and DMARC to prevent future fraud.