v=spf1 a ip4:12.34.56.78/28 include:acmeemailmarketing.com ~all You can use our toolHEREto test the validity of your SPF records. SPF is the cornerstone of your email delivery strategy. Are you confident your email is getting through?
只能有一条，但是可以一条记录里面加多个ip
不能. 参见From RFC 4408:3.1.2. Multiple DNS Records A domain name MUST NOT have multiple ...
Without the v tag, email servers would not recognize the string as an SPF record. It will cause failure in processing and enforcing the email-sending policies defined in the record. Example: v=spf1 2. IP4 tag The IP4 tag in an SPF record is a critical element that specifies authorized I...
SPF records can have up to 255 characters. Here’s what the syntax for an SPF record looks like: v=spf1 include:_spf.google.com include:example.com ip4:192.72.10.10 ~all In this example, the user is sending emails from: Google Workspace’s server (google.com) ...
Here is an example of the core components of an SPF record: v=spf1 ip4:192.0.2.0 ip4:192.0.2.1 include:examplesender.email -all This example lets the server know what type of record this is, states the approved IP addresses and a third-party for this domain, and tells the server what...
Your SPF record required more than 10 DNS Lookups to be performed during the test. The number of "include" mechanisms and chained "redirect' modifiers should be kept to a minimum. According to RFC 7208, 'SPF implementations MUST limit the number of mechanisms and modifiers that do DNS Lookups...
No, you won't because the change is ininclude:_netblocks3.google.com. That record is now: $ dig +short _netblocks3.google.com. txt "v=spf1 ip4:172.217.0.0/19 ip4:172.217.32.0/20 ip4:172.217.128.0/19 ip4:172.217.160.0/20 ip4:172.217.192.0/19 ...
; spf record for example.com example.com. IN TXT "v=spf1 include:example.net -all" ; use the SPF details for example.net ; in the above case to replace example.com's SPF ; or example.com. IN TXT "v=spf1 mx include:example.net -all" ...
; defensive mail host SPF mail IN TXT "v=spf1 ip4:192.168.0/27 -all" Notes:This SPF record allows any host in the 32 address subnet which contains 192.168.0 to send mail for this and any host virtual domain, for instance, vhost1.com in the above example. NOTE: while /27 allows ...