Can I use multiple SPF records?
No. You cannot have multiple SPF records for a domain. DNS allows only one SPF TXT record per domain. Multiple records cause SPF validation to fail.
If you need to authorize multiple sources (your server plus ESP plus marketing tools), combine them in one SPF record using include mechanisms.
Watch the 10 DNS lookup limit. Too many includes cause SPF to fail. If you have complex sending infrastructure, you may need to flatten records or use subdomains to stay within limits.
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