Answers to common questions about SPF records, lookup limits, and troubleshooting.
SPF is a DNS TXT record that lists the mail servers allowed to send for a domain. Receivers check it against the envelope sender, also called the Mail From or Return path domain.
No. SPF checks the envelope sender domain, not the visible From address. DMARC is what connects SPF to the visible From domain through alignment.
No. A domain should have one SPF record. Multiple v=spf1 records create a permanent error, so all authorized senders need to be combined into one record.
Common causes include too many DNS lookups, multiple SPF records, invalid syntax, missing sender includes, oversized TXT records, and DNS providers splitting records incorrectly.
Use soft fail while you are still discovering senders. Move to hard fail only when you are confident every legitimate sender is covered and your DMARC setup is stable.
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What you'll get with Suped
Real-time DMARC report monitoring and analysis
Automated alerts for authentication failures
Clear recommendations to improve email deliverability
