How do phishing detection systems flag legitimate senders?

Phishing detection systems occasionally flag legitimate senders when their messages resemble phishing characteristics. Understanding these false positive triggers helps avoid them.

Brand mentions in messages from non-brand domains raise flags. Mentioning "Microsoft" or "PayPal" in your content while sending from an unrelated domain looks like impersonation.

Login links pointing to unfamiliar domains trigger scrutiny. If your link leads to a login form, security filters analyze the destination carefully. Unrecognized domains may be blocked.

Urgent language about account security, verification requirements, or threats of account suspension mirrors phishing tactics. Legitimate security messages can trigger the same patterns.

Authentication misalignment where From domains do not match signing domains or lack proper DMARC makes your messages look spoofed even when they are not.

Legitimate messages that mimic attack patterns face friendly fire. Distinguish your communication clearly from what attackers would send.