> For the complete documentation index, see [llms.txt](https://docs.editran.onesait.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.editran.onesait.com/documentacion-editran/connect-v2.1-en/firma/administracionconnectfirma/canal/configuracion_canal_emision_con_firma.md).

# Sending channel

If a *channel* is for sending and has the signing feature checked:

* The files that are going to be sent through it must be signed beforehand, regardless of whether they are later sent to the other end signed or unsigned.
* The rules with which files are signed are defined through the *file groups* for signing purpose that are associated with the channel.
* The integrity of the files to be signed is verified from the moment they are accepted by Connect and until the sending takes place.
* The integrity of the signature files is verified from the moment they exist and until the sending takes place.
* Files are not configured from the **Contacts** and **Channels** menu but from the **File group**.
* In **Integration with applications**, the pre- and post-sending processes and programs act exclusively on the file that is sent (usually only one data or signature file).

The *file groups* already configured for the *channel*, when present, are listed in **Address book -> Contact -> Channel (Edit) → Files**.

![List of the file groups of a signed sending channel](https://64653979-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvdpBggYaSLH9X3nOAiMG%2Fuploads%2Fgit-blob-8834e31ba75ed1f1986e6ca9d9b57b8d791d5d59%2F02_listado_grupos_ficheros_canal_emision.png?alt=media)


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