post approval without subscription request

Hello! When trying to copy a public oasis mailing list on a widely copied message, time invariably comes when someone not subscribed attempts to reply only to find subscription is required to post.  Many people complain about this - a person might want to contribute only once - send a message but not to get unrelated traffic on the list.  It might seem like a small issue, but it is a big barrier to participation by communities such as the linux kernel community, which have etiquette rules against subscriber-only mailing lists. As a result virtio is forced to use an external list for development discussion, which is far from ideal.  It would be very benefitial, at least for lists such as virtio-dev which we use for virtio, if instead of requiring people to subscribe, the list software would - send back a message requesting agreement to IPR rules - after person agrees to IPR rules, let the message through,
and add the sender to list of addresses allowed to post  Is this something that can be added?  Thanks,

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MST