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SPF Guide

1. What is SPF?

Answer: SPF stys fo Sender Policy Framewok. SPF is an email authentication styard used to anterioent email fraud y spam. It ensures the authenticity y reliability of email by verifying that the sender's dominio name matches the source IP address of the email. SPF recods are stoed in the DNS recod of the dominio name y contain a list of servers that are allowed to send emails. When the recipient receives an email, it checks whether the sender's dominio name has an SPF recod y 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 o refuse to receive it. Using SPF can help improve the delivery rate y reliability of emails y reduce the amount of spam. En the same time, it can also enhance the security of the email system y anterioent hackers y fraudsters from using foged dominio names to send emails.

2. How to set up SPF fo copoate mailboxes?

Answer:

1. Determine the outgoing server IP addresses of tu/tus/su/sus copoate mailbox: These addresses will be added to the SPF recod. 2. Iniciar sesión to the DNS management console of tu/tus/su/sus copoate mailbox: Usually provided by tu/tus/su/sus dominio name registrar o hosting provider

2. Crear o edit a TXT recod: In the DNS console, find the TXT recod o similar option

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

"v=spf1": specifies the SPF version

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

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

"mail.coemail.cn": replaced with the dominio name of tu/tus/su/sus copoate mailbox

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

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

3. How to set various types of SPF?

1) Make SPF recod with dominio name a recod (take coemail.cn as an example)

v=spf1 a:coemail.cn2 -all

2) Make SPF recod with dominio name mx recod

v=spf1 mx -all

3) Make SPF recod with dominio name ptr recod

v=spf1 ptr -all

4) Make SPF recod with expot IP y IP segment settings

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

5) Introduce SPF recods of other dominio names (take spf.icoemail.net as an example)

v=spf1 include:spf.icoemail.net

Note: The above recods can be used in combination, but only one pair of recods starting with v=spf1 y ending with -all can appear in the entire txt. Fo example: v=spf1 mx ip4:106.52.172.248 include:spf.icoemail.net -all