12.7.3 Generating/Removing X-Envelope-to Header Lines

Keywords: x_env_to, nox_env_to

The x_env_to and nox_env_to keywords control the generation or suppression of X-Envelope-to header lines on copies of messages queued to a specific channel. On channels that are marked with the single keyword, the x_env_to keyword enables generation of these headers while the nox_env_to removes such headers from enqueued messages. The default is nox_env_to.

Although it will rarely make sense to do so, the x_env_to keyword can now be used without also setting single on a channel.