It should be possible to delete an email from outside the organization
A channel owner should be able to delete messages in the channel feed and act as a moderator. If someone has send an email from outside the organisation, no one can delete that email from the channel feed.
I couldn't agree more... it is crazy that something can come in but not be able to be deleted...
Use Case: we are using a webform to email job applications to a channel for review. Sometimes people accidentally submit the form twice, but the only way to remove an email would be to delete the whole channel right now...