Troubleshooting
5 articles
- DNS propagation and TTLWhy DNS changes lag, how TTL affects rollout, and how to verify TXT records globally.
- Mail arrives in spam despite passing authenticationDMARC can pass while folders still filter mail—check reputation, content signals, and mailbox-specific filters.
- Multiple SPF TXT recordsWhy multiple SPF TXT strings break validation and how to merge includes into a single record.
- Publishing DNS records in CloudflareTXT and CNAME entries for SPF, DKIM, and DMARC when Cloudflare proxies email-related names correctly.
- SMTP authentication errors when sendingCommon causes of SMTP auth failures for application mail—credentials, ports, TLS, and provider policies.