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HOWTO – Define an SPF Record – ZYTRAX Set up SPF in Office 365 to help prevent spoofing DNS SPF – Hetzner DokuWiki SPF - TXT Record SPF Record Syntax - Spam und UCE - Filter: SPF, SenderID - Sender Policy Framework – Wikipedia Sender-Authentifizierung mit Sender Policy Framework SPF: FAQ/Examples - dns - Create both IPv4 and IPv6 SPF record - Stack Overflow It is best practice to publish your SPF record via DNS as both a SPF record and and TXT record. v=spf1 include: v=spf1 a ip4:/28 Sender Policy Framework FAQ/Examples: What is an example of how a receiving mail server uses SPF? v=spf1 ip4: ip4: SPF Record Syntax: Note: This page The argument to the ip4: mechanism is an IPv4 network range. Examples: v=spf1 ip4:/16 -all v=spf1 a mx ip4:/24 ip6:2a01:488:42::/48 -all Wenn Sie nun fragen, Right now I have SPF IP4 and IP6 as two separate records, but IPv6 is not being recognized by Gmail. Should I merge them? It looks like this currently. How @ IN TXT v=spf1 mx ip4: a: -all es sind alle Rechner, für die MX-Records in dieser Domäne existieren, gültig v=spf1 a mx ip4:/24 ip6:2a01:488:42::/48 -all. Einzige Ausnahme: Wenn Ihre Domain per A-Record auf einen externen Server verweist, HOWTO - Define an SPF Record. the above could have been written as either @ IN TXT v=spf1 ip4:/27 -all IN TXT v=spf1 ip4:192 Anti-spam and anti-malware protection Set up SPF in Office 365 to help prevent spoofing. v=spf1. 2. Exchange Online Not common. ip4:23 Jeder SPF-Record beginnt mit einer Versionsnummer – für die aktuelle SPF-Version v=spf1. Es folgen beliebig viele Ausdrücke, ip4 … die