Troubleshooting
DMARC can pass while folders still filter mail—check reputation, content signals, and mailbox-specific filters.
Inspect received messages for spf=pass, dkim=pass, and dmarc=pass where applicable. Authentication alone does not guarantee inbox placement.
Sudden volume spikes, spammy wording, or attachment patterns can trigger junk folders independent of DNS records.
Some organizations maintain organizational allowlists—coordinate with IT when sender reputation is healthy but mail still lands in junk.
Why DNS changes lag, how TTL affects rollout, and how to verify TXT records globally.
Why multiple SPF TXT strings break validation and how to merge includes into a single record.
TXT and CNAME entries for SPF, DKIM, and DMARC when Cloudflare proxies email-related names correctly.
Common causes of SMTP auth failures for application mail—credentials, ports, TLS, and provider policies.
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