Level two domain name settings Test txt record (SPF record) pass

1. What is SPF?

Abbreviation for sender Policy Framework, a technology that authenticates e-mail senders as IP addresses, is a highly efficient spam solution.

The receiving party first checks the domain's SPF record to determine if the sender's IP address is included in the SPF record, and if it is considered to be a correct message, it will be considered a forged message to be returned.

2. How do I set SPF for my mailbox?

(1). SPF is implemented with the TXT record setting for the domain name.

To improve the success rate of mail delivery (other than @xishui139 mailbox), we recommend setting a TXT record for the domain name.

The following is the TXT record for xishui139.com (because there are multiple IP addresses by using mail transceiver on multiple server hosts)

Txt

@

Default

V=SPF1 ip4:180.166.35.68 ip4:222.66.158.164 Ip4:114.215.116.149-all

Query the TXT record as

650) this.width=650; "Src=" http://www.xishui139.com/wp-content/uploads/2015/06/A55F5B5D40428A4104.6D778155.jpg " alt= "A55f5b5d40428a4104.6d778155.jpg"/>

(2). e-Mail Test SPF is in effect

[email protected] sent to [email protected] message test spf=pass through

650) this.width=650; "Src=" http://www.xishui139.com/wp-content/uploads/2015/06/9C63C7AA40428A4104.6D778155.jpg " alt= "9c63c7aa40428a4104.6d778155.jpg"/>

3. Deep Understanding Examples

(1). Wrong wording: IPv4: 180.166.35.68 The red notation is wrong. IP4:180.166.35.68

(2). Similar wording ip4:180.166.35.68 equivalent to IP4:180.166.35.68/32

4. Two-level domain name TXT record notation

(1) xishui139.com Two-level domain name blog.xishui139.com record life

Txt

Blog

Default

V=SPF1 ip4:180.166.35.68 ip4:222.66.158.164 Ip4:114.215.116.149-all

650) this.width=650; "Src=" http://www.xishui139.com/wp-content/uploads/2015/06/AB628A614088E1AC32.6E778155.jpg " alt= "Ab628a614088e1ac32.6e778155.jpg"/>

(2). e-Mail Test SPF is in effect

[email protected] sent to [email protected] message test spf=pass through

650) this.width=650; "Src=" http://www.xishui139.com/wp-content/uploads/2015/06/B273796C4088E1AC32.6E778155.jpg " alt= "B273796c4088e1ac32.6e778155.jpg"/>

5. Extending the meaning of reading SPF record values

Results	Meaning	Server Processing methods
The sender IP is legal	accept Letters
	back letter
	accept letters, but Mark
SPF record does not have information about whether the sender IP is legitimate	accept letters
server does not set SPF record	accept Letters
	There is no provision for
Temperror	A temporary error has occurred (such as a DNS query failure)	Accept or Reject

Note that the approach is only recommended by the SPF standard, and not all mail servers can strictly follow this set of rules.

End!

Article title: Level two domain name settings Test txt record (SPF record) pass

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Level two domain name settings Test txt record (SPF record) pass