How do link mismatches raise red flags?

A link mismatch occurs when the visible text suggests one destination but the actual URL points somewhere different. This is a primary phishing technique and triggers aggressive filtering.

Example: displaying "Click to visit paypal.com" while linking to "malicious-site.ru/paypal-login" is exactly how credential theft attacks work. Filters specifically scan for this pattern.

Even unintentional mismatches cause problems. If your display text mentions a domain that differs from your actual link domain, filters notice. This is why branded link tracking domains should be clearly associated with your sending domain.

URL reputation compounds the issue. A mismatch pointing to a known bad domain can result in immediate blocking rather than just spam folder placement.

If your links say one thing but do another, you look like a deceiver. Transparency in linking builds trust with both filters and recipients.