Spoofed email: can’t determine Purported Responsible Address
I am studying the SMTP protocol and follow a course materials to setup a PoC spoofed email by talking with a SMTP server of our department.
This is what I have right now:
shuaiw@shuaicpu1:~$ telnet mail.XXXXXX 25
Trying XX… Continue reading Spoofed email: can’t determine Purported Responsible Address