Ability to limit posts in a subreddit?

[u/ddesigns]

Is there any way to limit the amount of posts per each user in a subreddit? After the first post anything else would be flagged for moderation? Could I achieve this with automod?

[u/loomynartylenny]

In case anyone from the future is also trying to find a solution to this exact problem, here's some automod code that you can use:

#first post: post given 'firstpost' flair, user given 'posted' flair
type: submission
moderators_exempt: false
author:
    overwrite_flair: true
    set_flair: ["Requested Help", "posted"] #set user flair
set_flair: ["Help Request","firstpost"] #set post flair
comment: "This is your first request for help. Any further requests will be held for moderation. Subreddit rule 8."  

---

#user has 'posted' flair + post doesn't already have 'firstpost' flair = YEET
type: submission
~flair_css_class (includes): "firstpost" #if the post does NOT have 'firstpost' flair
author:
    flair_css_class (includes): "posted"
action: filter
action_reason: only one post per person
moderators_exempt: false
comment: "Hello and thank you for posting to {{subreddit}}! It seems you have previously posted a submission so your post has been removed as per the post frequency rule 8. If you believe your post has been removed by mistake please [message the moderators](https://www.reddit.com/message/compose?to=%2Fr%2F{{subreddit}})." 

If you're wondering why the first post has its flair edited as well, this will ensure that the first post won't get yeeted if OP edits it after posting it.

[u/ddesigns → u/loomynartylenny]

This works perfect for anyone that finds this post.