I don't believe there is an actual permission that will prevent URLS from being posted. In the past, we have had to moderate each post to remove them and also rely on the spam quarantine to catch spammy links. Another idea could be to utilize the content filter. In your case, you only want people with specific roles to be able to put URLS in posts so that would be a process of moderating posts manually to ensure the only links are by those with certain roles.
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Thanks @NoamanA I'll have to create a post and try to get it to mark it as spam. Members of the community apparently haven't seen this banner. I haven't seen it as an admin either either in replies or in root articles/topics. People simply are reporting that it isn't there. @NicoleC I'm a one man show. We don't have moderators or people to be checking the site around the clock. Having a notification helps me in off hours be able to quickly see if there is anything for moderation or spam and release it quickly without having to log on and go to the home page and then click on the link on mobile. It's just overly labor intensive. Understood on the duplicate post however the point is that because the person feels that their post is just disappearing into the ether they're posting a second time. As a moderator if one is successful in posting and the other is not I'm not going to know it's a duplicate post unless they're both in spam and then I can see that they are copies and I can choose to release one and not the other. The point being that if there is some indicator immediately that the post has been labeled then the user is less apt to post again thereby not creating a duplicate post situation. It's just an odd moderation experience that is not very time efficient. If you have a moderation team that is one thing and you can figure it out but it doesn't scale well for community manager like myself who don't have a vacation back-up or others to share the burden.
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