What Is SPF/TXT Records?
An SPF record is a type of Domain Name Service (DNS) record that identifies which mail servers are permitted to send email on behalf of your domain. The purpose of an SPF record is to prevent spammers from sending messages with forged From addresses at your domain.
like : Suppose woodland company have email address as : firstname.lastname@example.org , So if I am able to send a mail using that address that means SPF records are not properly set .
Checking Missing SPF:
There Are Various Ways of Checking Missing SPF Records on a website But the Most Common and Popular way is kitterman.com
Enter Target Website Ex: target.com (Do Not Add https/http or www)
Hit Check SPF (IF ANY)
If You see any SPF Record than Domain is Not Vulnerable But if you see Nothing Here then “HURRAY! You Found a Bug”
Once There is No SPF Records. An Attacker Can Spoof Email Via any Fake Mailer Like Emkei.cz. An Attacker Can Send Email From name “Support” and Email: “email@example.com” .With Social Engineering Attack He Can TakeOver User Account Let Victim Knows the Phishing Attack but When He See The Email from the Authorized Domain. He Got tricked Easily.
How to reproduce this
Click on send email .It will directly send a mail from firstname.lastname@example.org to you