telnet mail.domain.com 25
helo my.domain.com
mail from: sender@domain.com
rcpt to: reciever@domain.com
data
Date: day, dd Mon YYYY
To: reciever@domain.com
From: sender@domain.com
Subject: Subject text
Text
.
quit
telnet mail.domain.com 25
helo my.domain.com
mail from: sender@domain.com
rcpt to: reciever@domain.com
data
Date: day, dd Mon YYYY
To: reciever@domain.com
From: sender@domain.com
Subject: Subject text
Text
.
quit