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Merge branch 'main' of https://github.com/xcad2k/cheat-sheets into main

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networking/mail-dns.md
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@@ -29,7 +29,7 @@ The reverse DNS record or also called PTR (Pointer Resource Record) is import
## (Optional but recommended) DNS Records
### SFP Record
### SPF Record
The SPF (Sender Policy Framework) is a TXT record on your DNS server that specifies which hosts are allowed to send mails for a given domain. When a mail server receives a mail that seems to come from your domain it can check if it’s a valid message. Some mail servers reject mails if they can’t validate that the message comes from an authorized mail server.
**Recommended Settings:**