I'm trying to send email using telnet in cmd. I have connection with telnet now. Btw I'm using a disposable email provider.
C:\Users\Student>telnet mail.dispostable.com 25
then it brought me here:
220 dispostable.com ESMTP
then I type the following command:
and I got:
250-Hi 250 SIZE 50000
I have successfully entered the "mail from:" command and received the 250 message successfully (means I'm set) but suddenly I failed on the "rcpt to:"
mail from: firstname.lastname@example.org 250 OK rcpt to: email@example.com 550 User Unknown
Can someone please enlighten me if I'm doing the right thing on choosing a temporary email provider as the sender account of this email and using Gmail as the receiver/victim.
I've been trying various email accounts for the recepients and always receive the 550 user unknown error.