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@@ -45,8 +45,9 @@ Does not include useless ones.
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- Specifies which IP addresses are allowed to send messages from the the `MAIL FROM` domain.
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- The record is distrubuted using a DNS TXT record with the same domain name.
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- Helps prevent email spoofing when used with DMARC.
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- - Don't specify or include more than 10 IP addresses as only 10 will be used.
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+ - Don't specify or include (recursively) more than 10 IP addresses as only 10 will be used.
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- When used with DMARC, the signing domain for one of the signatures must match the `From:` domain according to the DMARC alignment mode.
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+ - SPF records are not inherited by subdomains. They're only applied at the exact level.
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- Example TXT record: `v=spf1 mx include:example.net ~all`
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- `mx`: Allow sending from MX records for the same domain.
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- `include:example.net`: Include SFP records from the specified domain.
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Håvard O. Nordstrand