Spam filter tuning without blind spots
Aggressive block lists feel productive until legitimate mail vanishes. How to tighten filtering without losing invoices, MFA codes, and vendor threads.
Email & Collaboration
Mail flow, spam, phishing, and the shared spaces people work in.
4 articles
Retiring leftover on-prem Exchange after you move to Microsoft 365
Hybrid connectors, old MX records, and ghost servers still cost you money and attack surface long after mail lives in the cloud.
DNS and email authentication: SPF, DKIM, and DMARC
A practical rollout for authorizing every legitimate sender, signing mail, enforcing DMARC, and catching gaps before messages get rejected.
Business email compromise: red flags worth a phone call
How small businesses can recognize payment fraud, verify a request outside email, and respond quickly when money or a mailbox may be at risk.