How can broken CNAME or tracking domains affect deliverability?

Tracking domain problems:

Broken CNAME effects:

Links do not resolve or redirect properly

SSL certificate errors

Click tracking fails

Open tracking fails

Deliverability impact:

ESP may fall back to shared tracking domain

Shared domains have mixed reputation

Broken links look suspicious to filters

Recipients see errors, may report as spam

Diagnosis:

Test links in emails

Verify CNAME resolves correctly

Check SSL certificate validity

Confirm tracking records in ESP

Prevention:

Monitor tracking domain health

Alert on CNAME or SSL issues

Test after any DNS changes

Broken waybill tracking makes shipments look suspicious and causes delivery issues.