SMTP
SMTP HELO
RFC821
#
# Server-side
REPLY EHLO 500 Command unrecognized
REPLY HELO 250 Already old but still servicing...
#
# Client-side
smtp
RFC821-only SMTP server (EHLO not supported)
From: different
To: another
body
smtp://%HOSTIP:%SMTPPORT/user --mail-rcpt 804@foo --mail-from 804@from -T -
#
# Verify data after the test has been "shot"
EHLO user
HELO user
MAIL FROM:804@from
RCPT TO:<804@foo>
DATA
QUIT
From: different
To: another
body
.