Connect with Putty to SMTP server.
Connection Type: Telnet
Port: 25
helo domain.com
250 OK
mail from: <sender@domain.com>
250 OK
rcpt to: <receive@domain.com>
250 OK
data
354 Send data.
subject: test message 2x Enter test .
250 OK
quit
Connect with Putty to SMTP server.
Connection Type: Telnet
Port: 25
helo domain.com
250 OK
mail from: <sender@domain.com>
250 OK
rcpt to: <receive@domain.com>
250 OK
data
354 Send data.
subject: test message 2x Enter test .
250 OK
quit