$ telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 inspiron ESMTP Postfix (Ubuntu) HELO localhost 250 inspiron MAIL From:<rudeboyjet@localhost.localdomain> 250 2.1.0 Ok RCPT TO:<rudeboyjet@mail.com> 250 2.1.5 Ok DATA 354 End data with <CR><LF>.<CR><LF> Su…</lf></cr></lf></cr></rudeboyjet@mail.com></rudeboyjet@localhost.localdomain>