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- 13 minutes read
Apple Branded Mail: Authentication-First Setup
Apple Branded Mail: Authentication-First Setup
Apple Branded Mail displays your logo in Apple Mail, but only when DMARC is set to quarantine or reject. Learn more in our authentication-first setup guide.
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All blog articles
- 9 minutes read
What to Address Before DMARC Enforcement
Learn the four things companies should address before DMARC enforcement: Operational impact, rollback procedures, stakeholder communication, & success metrics.
- 9 minutes read
SPF Governance in Enterprise Environments
See how enterprises can improve SPF governance with clearer ownership, structured DNS change processes, and better cross-team alignment.
- 9 minutes read
VMC vs. CMC: Choosing a BIMI Certificate
The VMC vs. CMC decision isn’t always straightforward. This guide covers the key differences to help you choose the right BIMI certificate.
- 10 minutes read
Enterprise Email Security Best Practices
Learn what enterprise email security involves, the most common threats businesses face, and the best practices that help protect your domains, users, and brand.
- 10 minutes read
Ignition Launches Managed DMARC in North America
Ignition and Sendmarc have launched managed DMARC in North America, helping partners deliver stronger email authentication and domain protection.
- 9 minutes read
Why DIY DMARC Costs More Than Teams Expect
DIY DMARC often creates hidden costs through staff training, manual report analysis, and ongoing maintenance. Discover a simpler way to manage it.
- 9 minutes read
Enterprise DKIM Key Management Strategies
Effective DKIM key management helps reduce the risk of spoofing. This is especially important in large organizations with complex sending environments.
- 12 minutes read
Why Enterprise Teams Need DMARC Solutions
Learn how DMARC solutions help enterprise teams reduce complexity, improve sender visibility, strengthen governance, and move toward enforcement.
- 14 minutes read
DMARC troubleshooting checklist for enterprises
Use this DMARC troubleshooting checklist to identify and fix syntax, SPF, DKIM, alignment, and sender issues before moving to stronger enforcement.
- 8 minutes read
How to fix “550 From Address” rejections
A “550 From Address Violates UsernameCaseMapped Policy” rejection is permanent. Learn the most common causes of this error – and the steps to fix it.
- 9 minutes read
Resolve SOA serial number format errors
Fix the “SOA serial number format is invalid” error. Learn which SOA serial number formats are valid, what causes the issue, and how to correct it.
- 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.