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  AIXF: Per-Forum Maximum Message Length

  This XenForo add-on allows you to configure different maximum message lengths per forum node.

  maximum message

  maximum message length

  message length
  About this resource

  AIXF: Per-Forum Maximum Message Length
  
  This XenForo add-on allows you to configure different maximum message lengths per forum node.
  It enforces limits when users create threads, post replies, or edit messages.
  
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  ## How it works
  

  • A global maximum is defined in ACP → Options → Messages → Maximum message length.
  • Each forum node has a field under Advanced options → Per-forum maximum message length.
  • When set to 0, the forum inherits the global maximum.
  • When set to a number greater than 0, that number overrides the global maximum for that forum.

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  ## Important setup notes
  

  • Do not set the global maximum to something extreme like 50,000 unless you want every forum to allow it.
  • Raising the global applies site-wide.
  • This can lead to performance and moderation issues.
  • The recommended baseline is 10,000 characters for most forums.
  • If you need one or more forums with a higher cap:

  1. Set the global maximum to the high number you want (e.g., 50,000).
  2. For every other forum, go to ACP → Forums → Nodes → Edit forum → Advanced options and set Per-forum maximum message length to a lower value (e.g., 10,000).
  3. Leave the special forum(s) at 0 (inherit global) or explicitly set them to the higher value.
  
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  ## Example setup
  

  • Global maximum: 50,000
  • Special forum: leave at 0 (inherits 50,000)
  • All other forums: set per-forum maximum to 10,000

  Result:
  

  • Special forum allows posts up to 50,000 characters.
  • All other forums are capped at 10,000 characters.

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  ## Why not just raise global for everyone?
  

  • Large posts everywhere can impact database size, search indexing, and moderation workload.
  • Most forums do not need more than 10,000 characters.
  • Use per-forum overrides to keep posting reasonable while allowing long-form content where needed.

  
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