How do I keep href links valid in HTML email?
Always use absolute URLs with https, avoid empty or “#” href values, and make sure mailto/tel links are well-formed. Broken hrefs hurt clicks and can trigger spam filters.
Key Takeaways
-
✓
Use
https://for all external links. - ✓ Avoid placeholder “#” or javascript: URLs.
- ✓ html2email flags empty or invalid hrefs.
Always use absolute URLs with https, avoid empty or “#” href values, and make sure mailto/tel links are well-formed. Broken hrefs hurt clicks and can trigger spam filters.
<!-- Good: absolute https -->
<a href="https://example.com/offer" style="color:#0066cc;">Claim offer</a>
<!-- Good: mailto -->
<a href="mailto:support@example.com?subject=Help">Contact us</a>
<!-- Bad: avoid -->
<a href="#">...</a> <!-- or href="" or javascript: -->https and mailto are safe. Avoid #, empty, or javascript:.
Why avoid relative or “#” links?
Email doesn’t have a base URL. Relative links and placeholders break, leading to lost clicks and potential spam signals.
What’s the correct format for mailto/tel links?
mailto:support@example.com and tel:+1234567890. Avoid spaces and encode subject/body parameters.
How should I handle UTM tracking?
Use lowercase parameters, keep them short, and ensure they don’t exceed character limits for ESP link wrapping. Always start with https.
Can javascript: be used in email links?
No. Many clients strip or break these links. Use real URLs only.
How does html2email detect bad hrefs?
The LinkValidator checks for missing/empty href, javascript: schemes, and bare “#” placeholders.
Should CTA buttons have text + href?
Yes. Keep the CTA in live text plus a valid href to retain action if images are blocked.
How do I avoid link wrapping issues?
Keep links short, avoid unnecessary parameters, and test with your ESP’s link tracking enabled.
Do anchors within the email work?
In-page anchors are unreliable in many clients. Prefer full URLs or duplicated content instead of fragment links.
Validator showing invalid href warning.
Key stats and sources
- Internal QA: 12% of support tickets came from missing/placeholder hrefs; fixed by enforcing https and non-empty links.
- ESP best practices: avoid javascript: and relative links to prevent blocking.
- html2email flags empty, “#”, and javascript: hrefs for quick remediation.
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