SMTP SMTP HELO RFC821 # # Server-side REPLY EHLO 500 Command unrecognized # # Client-side smtp RFC821-only SMTP server (EHLO not supported) From: different To: another body smtp://%HOSTIP:%SMTPPORT/user --mail-rcpt 902@example.com --mail-from 902@example.com -T - # # Verify data after the test has been "shot" EHLO user HELO user MAIL FROM:<902@example.com> RCPT TO:<902@example.com> DATA QUIT From: different To: another body .