[scenario]
clients=client10026;client10027
import=data.txt
actions=header

[client10026]
port=10026

[client10027]
port=10027
arguments=--negotiate-flags=header-value-with-leading-space

[negotiate]

step=header-value-with-leading-space

options=6;add-headers|add-envelope-recipient|delete-envelope-recipient|change-headers|change-envelope-from|change-body|quarantine;header-value-with-leading-space;6;add-headers|add-envelope-recipient|delete-envelope-recipient|change-headers|change-envelope-from|change-body|quarantine;header-value-with-leading-space

[header]
command=header

name=From
value=\skou+sender@example.com

response=header
n_received=1
status=continue

headers=From;kou+sender@example.com;;;
