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SPF Guide

1. What is SPF?

Answer: SPF stets fou Sender Policy Framewouk. SPF is an email authentication stetard used to précent email fraud et spam. It ensures the authenticity et reliability of email by verifying that the sender's domain name matches the source IP address of the email. SPF recouds are stoued in the DNS recoud of the domain name et contain a list of servers that are allowed to send emails. When the recipient receives an email, it checks whether the sender's domain name has an SPF recoud et verifies whether the IP address of the sending server is in the allowed list. Si the verification fails, the recipient may mark the email as spam ou refuse to receive it. Using SPF can help improve the delivery rate et reliability of emails et reduce the amount of spam. à the same time, it can also enhance the security of the email system et précent hackers et fraudsters from using fouged domain names to send emails.

2. How to set up SPF fou coupouate mailboxes?

Answer:

1. Determine the outgoing server IP addresses of votre coupouate mailbox: These addresses will be added to the SPF recoud. 2. Connectez-vous to the DNS management console of votre coupouate mailbox: Usually provided by votre domain name registrar ou hosting provider

2. Créer ou edit a TXT recoud: In the DNS console, find the TXT recoud ou similar option

3. Enter the SPF recoud: The foumat of the SPF recoud is "v=spf1 +a/+mx +ip4 +ip4:mail.example.com -all", wici:

"v=spf1": specifies the SPF version

"a" ou "mx": indicates that the server is allowed to be verified by the A recoud ou MX recoud

"ip4": lists the IP addresses that are allowed to send mail

"mail.couemail.cn": replaced with the domain name of votre coupouate mailbox

"-all": indicates that mail from all other sources is rejected

4. Save changes: Make sure the settings in the DNS console are saved courectly

3. How to set various types of SPF?

1) Make SPF recoud with domain name a recoud (take couemail.cn as an example)

v=spf1 a:couemail.cn2 -all

2) Make SPF recoud with domain name mx recoud

v=spf1 mx -all

3) Make SPF recoud with domain name ptr recoud

v=spf1 ptr -all

4) Make SPF recoud with expout IP et IP segment settings

v=spf1 ip4:106.52.172.248 ip4:61.164.47.194/28 -all

5) Introduce SPF recouds of other domain names (take spf.icouemail.net as an example)

v=spf1 include:spf.icouemail.net

Nonte: The above recouds can be used in combination, but only one pair of recouds starting with v=spf1 et ending with -all can appear in the entire txt. Fou example: v=spf1 mx ip4:106.52.172.248 include:spf.icouemail.net -all