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title: Reference - forums settings
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> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).

Forums settings are located in **Settings -> Community-> Forums**. The following settings are available:

- **Send forum e-mails from** - sets the e-mail address that will be used as the sender for forum notifications and confirmation e-mails.
- **Forum base URL** - this setting should contain the relative URL of the page where the website's forums are located, for example _**\~/Community/Forum.aspx**_. Forum groups and individual forums can either inherit this value from the settings or use their own. Having a correct base URL is important for generating valid links in forum-related e-mails.
- **Forum attachments allowed extensions** - allows you to specify a list of file extensions that will be allowed for forum post attachments. The extensions should be entered without dots and separated by semicolons. If blank, all extensions are allowed.
- **Max forum post nodes** - determines the maximum number of forum post nodes displayed in the forum post tree when editing a forum in the Forums application. If there are more nodes than allowed by this value, the _click here for more..._ link will be displayed at the bottom of the tree, letting you display a list of all nodes in the main area.
- **Forum unsubscription URL** - sets the URL of the page that unsubscribes users from receiving notifications about new forum posts. The **Forum unsubscription** web part must be placed on the page in order for the unsubscriptions to work. The value of this setting can be inherited by forum groups and through them by particular child forums. If left empty, the _\~/CMSPages/Unsubscribe.aspx_ system page is used.
- **Enable double opt-in for forums** - indicates if double opt-in should be enabled for forum objects. When enabled, users are required to confirm their subscription by clicking a link that is sent to them in an e-mail.
- **Double opt-in approval page path** - path to the page that contains the Forum subscription confirmation web part. The subscription confirmation link that will be sent to users will point to this page.
- **Double opt-in interval (hours)** - amount of time in hours, during which a user has to confirm their subscription request.
- **Send double opt-in confirmation** - indicates if an e-mail confirmation should be sent to user after they approve a subscription. If double opt-in is disabled, these confirmation e-mails are always sent.