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- 13 minutes read
Abnormal and Sendmarc: Integrated Cybersecurity
Abnormal and Sendmarc: Integrated Cybersecurity
See how Abnormal and Sendmarc protect your inbox, your domain, and everyone who receives email on your company’s behalf.
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All blog articles
- 10 minutes read
SPF Record Audit: A Step-by-Step Workflow
An SPF record audit checks syntax, lookup count, and sender mapping. See the five-step workflow to fix issues without disrupting email flow.
- 12 minutes read
DMARC XML Reports Explained: Key Fields to Check
DMARC XML reports hold key fields most teams skim past. See what source_ip, policy_evaluated, and disposition are actually telling you.
- 9 minutes read
DKIM Key Rotation Guide for Compliance Teams
A practical guide to DKIM key rotation for compliance teams, covering key length, selector inventory, and the documentation auditors expect to see.
- 10 minutes read
DKIM Signature: Creation and Compromise
Learn how a DKIM signature is created and verified, and what happens to your email security once the private key is compromised.
- 11 minutes read
SPF Record Creation Guide for Enterprise Teams
A practical guide to SPF record creation at scale, covering lookup limits, subdomain policy, and the governance structure enterprises need to maintain SPF.
- 10 minutes read
Getting SPF Record Structure Right at Scale
SPF record structure decisions determine whether your record hits the DNS lookup limit. Explore flattening, macros, and qualifier options that hold up at scale.
- 11 minutes read
SPF Audit Checklist for Multi-Vendor Environments
This SPF audit checklist covers sender inventory, DNS review, and monitoring readiness before SPF record creation begins.
- 10 minutes read
Subdomain Records vs. Root Domain Records
Subdomain records isolate senders and lookup counts. See when enterprises should use them instead of one root domain record.
- 10 minutes read
Enterprise SPF Configuration Done Right
Enterprise SPF configuration can look fine until just one more vendor causes it to fail. See real record examples, plus how to audit yours.
- 11 minutes read
SPF a Record Risk: What It May Authorize
Learn how your SPF a record can authorize infrastructure you don’t control, and follow audit steps to catch spoofing exposure before it’s exploited.
- 12 minutes read
Black Hat USA 2026 Agenda and Prep Guide
A practical guide to Black Hat USA 2026, covering key agenda themes and tips for evaluating vendors, learning, and networking.
- 9 minutes read
Vendor Stacking: Why Your SPF Record Fails
Vendor stacking can push your SPF record past the 10-lookup limit. Learn how to audit your senders, flatten includes, and prevent PermError failures.
- 17 minutes read
Production-Ready SPF: What Enterprises Must Know
Production-ready SPF means more than valid syntax. See the 8 gaps that surface in an SPF audit and the checklist organizations can use to close them.
- 9 minutes read
Enterprise SPF Rollout: From ~all to -all
A step-by-step guide to enterprise SPF rollout for multi-sender domains, covering DNS architecture, staged enforcement, and testing.
- 12 minutes read
Audit Evidence Guide for Enterprise Teams
Enterprise teams need audit evidence, not just DMARC configuration. See how to document policy, monitoring, and domain ownership.
- 9 minutes read
Securing Sending Infrastructure at Scale
Sending infrastructure grows complex fast. Learn how SPF lookup limits, subdomain gaps, and governance affect enterprise email authentication.
- 10 minutes read
DMARC Rollout Playbook for Enterprise Domains
This DMARC rollout guide covers phased enforcement, domain sequencing, and governance for enterprises managing multiple domains.
- 14 minutes read
Strengthening Authentication Posture Past SPF
Strengthening your authentication posture means pairing SPF with DMARC enforcement, sender inventories, and lookup limit management.