Email link sandboxing expectations for clients

Overview

Defender for Office 365 Safe Links rewrites URLs and scans at click-time. Clients need realistic expectations about delays and rare breakage.

Set expectations

• First-time safe links may add latency of a second or more.
• Certain transactional emails with one-time tokens may need tenant exceptions—document them.

Troubleshooting loop

1. Identify URL domain category: OAuth, marketing, CDN, file share.
2. Review detonation details and phish similarity—not all “blocked” are malicious; may be reputation.
3. Use report false positive through proper channel when business-critical.

Policy tiers

Strict policy for executives/finance; standard for general users; differentiate attachment policies similarly.

Training tie-in

Teach users that rewritten links are normal in protected tenants; reduces unnecessary panic.

Audit & compliance

Safe Links/Safe Attachments status is a common insurer question—export configuration summaries quarterly.