SPF - Revision history

Woozle at 20:26, 21 December 2022

2022-12-21T20:26:17Z

← Older revision		Revision as of 20:26, 21 December 2022
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			[[category:anti-spam]]
			[[category:email/server/configuration]]
	{{fmt/title\|SPF: Sender Policy Framework}}		{{fmt/title\|SPF: Sender Policy Framework}}
	==About==		==About==

Woozle at 20:25, 21 December 2022

2022-12-21T20:25:34Z

← Older revision		Revision as of 20:25, 21 December 2022
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	Tentatively, it's best to think of "modifiers" as a small set of additional directives. It's noted in that they're intended to allow for future expansion		Tentatively, it's best to think of "modifiers" as a small set of additional directives. It's noted in that they're intended to allow for future expansion
			==Examples==
			This config seems to be at least partly functional:
			'''TXT''' v=spf1 mx mx:mail.vbz.net a a:mail.vbz.net ~all

			This config does not get through to Gmail:
			'''TXT''' v=spf1 ip4:165.227.176.23 ip6:2604:a880:800:a1::126e:6001 -all
	==Links==		==Links==
	* {{wikipedia\|Sender Policy Framework}}		* {{wikipedia\|Sender Policy Framework}}
	* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])		* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])

Woozle: /* Links */

2022-08-19T14:10:28Z

Links

← Older revision		Revision as of 14:10, 19 August 2022
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	* {{wikipedia\|Sender Policy Framework}}		* {{wikipedia\|Sender Policy Framework}}
	* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])		* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])
	* [https://dmarcadvisor.com/spf-syntax-table/ SPF Record Syntax]

Woozle: /* Links */

2022-08-19T14:04:00Z

Links

← Older revision		Revision as of 14:04, 19 August 2022
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	* {{wikipedia\|Sender Policy Framework}}		* {{wikipedia\|Sender Policy Framework}}
	* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])		* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])
			* [https://dmarcadvisor.com/spf-syntax-table/ SPF Record Syntax]

Woozle at 23:58, 18 August 2022

2022-08-18T23:58:59Z

← Older revision		Revision as of 23:58, 18 August 2022
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	directive = [ qualifier ] mechanism		directive = [ qualifier ] mechanism
	~~qualifier~~ = "+" / "-" / "?" / "~"		{{l/sub\|qual}}ifier = "+" / "-" / "?" / "~"
	mechanism = ( all / include / a / mx / ptr / ip4 / ip6 / exists )		mechanism = ( all / include / a / mx / ptr / ip4 / ip6 / exists )
	modifier = redirect / explanation / unknown-modifier		modifier = redirect / explanation / unknown-modifier

Woozle at 17:07, 18 August 2022

2022-08-18T17:07:47Z

Woozle: Created page with "{{fmt/title|SPF: Sender Policy Framework}} ==About== SPF (Sender Policy Framework) is an anti-spam protocol in which a DNS record specifies what IP addresses are allowed t..."

2022-08-18T15:36:17Z

Created page with "{{fmt/title|SPF: Sender Policy Framework}} ==About== SPF (Sender Policy Framework) is an anti-spam protocol in which a DNS record specifies what IP addresses are allowed t..."

New page

{{fmt/title|SPF: Sender Policy Framework}}
==About==
[[SPF]] (Sender Policy Framework) is an anti-spam protocol in which a DNS record specifies what IP addresses are allowed to send messages with a "from" address coming from that domain. The IP addresses may be specified literally (numerically) or given as domain-names. SPF is defined in [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status]).
===DNS Configuration===
Discussion of the DNS record format is in [https://www.rfc-editor.org/rfc/rfc7208.html#section-3 Section 3]. SPF uses TXT records; there must be only one SPF record per domain or subdomain. A record's contents must start with "<code>v=spf1</code>" in order to be recognized as an SPF record.

The remainder of the contents consists of a mix of {{l/sub|mechanism}}s and {{l/sub|modifier}}s, combined according to these nearly-indecipherable rules:
terms = *( 1*SP ( directive / modifier ) )

directive = [ qualifier ] mechanism
qualifier = "+" / "-" / "?" / "~"
{{l/sub|mechanism}} = ( all / include / a / mx / ptr / ip4 / ip6 / exists )
{{l/sub|modifier}} = redirect / explanation / unknown-modifier
unknown-modifier = name "=" macro-string
; where name is not any known modifier

name = ALPHA *( ALPHA / DIGIT / "-" / "_" / "." )
==Links==
* {{wikipedia|Sender Policy Framework}}
* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])

← Older revision		Revision as of 17:07, 18 August 2022
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	{{fmt/title\|SPF: Sender Policy Framework}}		{{fmt/title\|SPF: Sender Policy Framework}}
	==About==		==About==
	[[SPF]] (Sender Policy Framework) is an anti-spam protocol in which a DNS record specifies what IP addresses are allowed to send messages with a "from" address coming from that domain. The IP addresses may be specified literally (numerically) or ~~given~~ as domain-names. SPF is defined in [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status]).		[[SPF]] (Sender Policy Framework) is an anti-spam protocol in which a DNS record specifies what IP addresses are allowed to send messages with a "from" address coming from that domain. The IP addresses may be specified literally (numerically, using [[/term/cidr-length\|CIDR address-range syntax]]) or as domain-names. SPF is defined in [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status]).
	===DNS Configuration===		===DNS Configuration===
	Discussion of the DNS record format is in [https://www.rfc-editor.org/rfc/rfc7208.html#section-3 Section 3]. SPF uses TXT records; there must be only one SPF record per domain or subdomain. A record's contents must start with "<code>v=spf1</code>" in order to be recognized as an SPF record.		Discussion of the DNS record format is in [https://www.rfc-editor.org/rfc/rfc7208.html#section-3 Section 3]. SPF uses TXT records; there must be only one SPF record per domain or subdomain. A record's contents must start with "<code>v=spf1</code>" in order to be recognized as an SPF record.

	The remainder of the contents consists of a ~~mix~~ of ~~{{l/sub\|mechanism}}s and {{l/sub\|modifier}}s~~, ~~combined~~ according to these nearly-indecipherable rules:		The remainder of the contents consists of a set of terms, formatted according to these nearly-indecipherable rules:
	~~terms~~ = ( 1SP ( directive / modifier ) )		{{l/sub\|term}}s = ( 1SP ( directive / modifier ) )

	directive = [ qualifier ] mechanism		directive = [ qualifier ] mechanism
	qualifier = "+" / "-" / "?" / "~"		qualifier = "+" / "-" / "?" / "~"
	~~{{l/sub\|~~mechanism}} = ( all / include / a / mx / ptr / ip4 / ip6 / exists )		mechanism = ( all / include / a / mx / ptr / ip4 / ip6 / exists )
	~~{{l/sub\|~~modifier}} = redirect / explanation / unknown-modifier		modifier = redirect / explanation / unknown-modifier
	unknown-modifier = name "=" macro-string		unknown-modifier = name "=" macro-string
	; where name is not any known modifier		; where name is not any known modifier

	name = ALPHA *( ALPHA / DIGIT / "-" / "_" / "." )		name = ALPHA *( ALPHA / DIGIT / "-" / "_" / "." )

			This seems to translate to "one or more terms, where each term starts with either {a ''qualifier'' followed by a ''directive'' (which is a qualifier plus a mechanism)} or a ''modifier'', and multiple terms are separated by spaces".

			Tentatively, it's best to think of "modifiers" as a small set of additional directives. It's noted in that they're intended to allow for future expansion
	==Links==		==Links==
	* {{wikipedia\|Sender Policy Framework}}		* {{wikipedia\|Sender Policy Framework}}
	* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])		* [https://www.rfc-editor.org/rfc/rfc7208.html RFC 7208] ([https://datatracker.ietf.org/doc/draft-ietf-spfbis-4408bis/21/ status])