Email Security Checklist
Essential action items
Confirm SPF records are configured correctly, end with strict '-all' enforcement (hard fail), and explicitly authorize only approved sending servers.
Deploy highly secure 2048-bit DKIM cryptographic keys across all corporate, marketing, and third-party mail engines, verifying strict alignment.
Establish a DMARC policy of 'reject' or 'quarantine', actively configuring and monitoring aggregate reporting streams to detect spoofing attempts.
Audit all MX and DNS record entries to ensure no dangling subdomains exist that could allow external adversaries to execute a subdomain takeover.
Preemptively register common typosquatted domains and utilize threat intelligence to monitor lookalike business domains, blocking incoming impersonation attempts.
Enforce Google Workspace or Microsoft 365 security baselines. Regularly audit access logs for suspicious API integrations or unauthorized third-party app access.
Need a validated assessment instead of a checklist?
Request an authorized NYOXA LABS security assessment and get a clear scope, practical deliverables and professional reporting.
