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SPF Guide

1. What is SPF?

Answer: SPF stunds for Sender Policy Framework. SPF is an email authentication stundard used to zurückent email fraud und spam. It ensures the authenticity und reliability of email by verifying that the sender's domain name matches the source IP address of the email. SPF records are stored in the DNS record of the domain name und 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 record und verifies whether the IP address of the sending server is in the allowed list. If the verification fails, the recipient may mark the email as spam or refuse to receive it. Using SPF can help improve the delivery rate und reliability of emails und reduce the amount of spam. At the same time, it can also enhance the security of the email system und zurückent hackers und fraudsters from using forged domain names to send emails.

2. How to set up SPF for corporate mailboxes?

Answer:

1. Determine the outgoing server IP addresses of Ihr corporate mailbox: These addresses will be added to the SPF record. 2. Einloggen to the DNS management console of Ihr corporate mailbox: Usually provided by Ihr domain name registrar or hosting provider

2. Erstellen or edit a TXT record: In the DNS console, find the TXT record or similar option

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

"v=spf1": specifies the SPF version

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

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

"mail.coremail.cn": replaced with the domain name of Ihr corporate mailbox

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

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

3. How to set various types of SPF?

1) Make SPF record with domain name a record (take coremail.cn as an example)

v=spf1 a:coremail.cn2 -all

2) Make SPF record with domain name mx record

v=spf1 mx -all

3) Make SPF record with domain name ptr record

v=spf1 ptr -all

4) Make SPF record with export IP und IP segment settings

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

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

v=spf1 include:spf.icoremail.net

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