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SPF Guide

1. What is SPF?

Answer: SPF st?s f?? Sender Policy Framew??k. SPF is an email authentication st?ard used to ??????ent email fraud ? spam. It ensures the authenticity ? reliability of email by verifying that the sender's ?????? name matches the source IP address of the email. SPF rec??ds are st??ed in the DNS rec??d of the ?????? name ? contain a list of servers that are allowed to send emails. When the recipient receives an email, it checks whether the sender's ?????? name has an SPF rec??d ? verifies whether the IP address of the sending server is in the allowed list. ??? the verification fails, the recipient may mark the email as spam ?? refuse to receive it. Using SPF can help improve the delivery rate ? reliability of emails ? reduce the amount of spam. ?? the same time, it can also enhance the security of the email system ? ??????ent hackers ? fraudsters from using f??ged ?????? names to send emails.

2. How to set up SPF f?? c??p??ate mailboxes?

Answer:

1. Determine the outgoing server IP addresses of ????? ?? c??p??ate mailbox: These addresses will be added to the SPF rec??d. 2. ????? ?????? to the DNS management console of ????? ?? c??p??ate mailbox: Usually provided by ????? ?? ?????? name registrar ?? hosting provider

2. ????? ?? edit a TXT rec??d: In the DNS console, find the TXT rec??d ?? similar option

3. Enter the SPF rec??d: The f??mat of the SPF rec??d is "v=spf1 +a/+mx +ip4 +ip4:mail.example.com -all", w???:

"v=spf1": specifies the SPF version

"a" ?? "mx": indicates that the server is allowed to be verified by the A rec??d ?? MX rec??d

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

"mail.c??email.coremail": replaced with the ?????? name of ????? ?? c??p??ate mailbox

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

4. Save changes: Make sure the settings in the DNS console are saved c??rectly

3. How to set various types of SPF?

1) Make SPF rec??d with ?????? name a rec??d (take c??email.cn as an example)

v=spf1 a:c??email.cn2 -all

2) Make SPF rec??d with ?????? name mx rec??d

v=spf1 mx -all

3) Make SPF rec??d with ?????? name ptr rec??d

v=spf1 ptr -all

4) Make SPF rec??d with exp??t IP ? IP segment settings

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

5) Introduce SPF rec??ds of other ?????? names (take spf.ic??email.net as an example)

v=spf1 include:spf.ic??email.net

??te: The above rec??ds can be used in combination, but only one pair of rec??ds starting with v=spf1 ? ending with -all can appear in the entire txt. F?? example: v=spf1 mx ip4:106.52.172.248 include:spf.ic??email.net -all