v=spf1 ip4:192.168.0.0/16~all We can include as many IP addresses, both IPv4 and IPv6, or even subnet ranges as we wish. For example, we could amend the previous record like so: v=spf1ipv4:219.0.188.54ipv6:2001:0db8:85a3:0000:0000:8a2e:0370:7334ip4:192.168.0.0/16~all 2. Red...
Theinclude,a,mx,ptr, andexistsmechanisms as well as theredirectmodifier do count against this limit. Theall,ip4, andip6mechanisms do not require DNS lookups and therefore do not count against this limit. Theexpmodifier does not count against this limit because the DNS lookup to fetc...
The syntax is divided into a version prefix and an include tag that precedes a server that can send email through your domain. The version prefix simply explains that this TXT record is to be used for SPF checking, and the include holds the authorized server. The “~all” part instructs ...
“v=spf1 ip4:12.34.56.78 include:example.com -all” The receiving server will now check to see if the IP address of the SMTP client trying to send the message is included in the SPF record. If the IP address is listed, the message will pass SPF authentication. The nitty-gritty: br...
ip4: 198.51.100.0/24 include:_spf.google.com include:mailservice.example.net ~all Taking this record one line at a time, mechanisms are explained in the following table: In this example, the domain owner authorizes email sent from servers located on its own IP network:198.51.100.0...
this text:v=spf1 include:_spf.google.com ~all. If you are sending email from your server (e.g. a web application sending emails through postfix server configured on your cloud), you need to add it’s IP address as well, like so,v=spf1 ip4:192.168.10.10include:_spf.google.com ~...
Takeaway SPF records are a method to authenticate emails and verify that they are from the allowed sources, and are who they claim they are. However, SPF is not capable of performing an action based on the authentication results – it can only perform a check. This is where DMARC comes in...
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