---
type: source
title: "Mozilla Thunderbird: Filelink via Nextcloud"
tags: [email, nextcloud, thunderbird, extensions]
related: [nc-connector, nextcloud, mozilla-thunderbird]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_e_mail_e_mail_einrichten_mozilla_thunderb.md"]
---

# Mozilla Thunderbird: Filelink via Nextcloud

This source provides technical instructions for integrating Mozilla Thunderbird with the university's Nextcloud instance to handle large email attachments.

## Summary
The guide explains how to use the **NC Connector** extension to automate the process of uploading large files to Nextcloud and inserting a download link into an email, rather than sending the file as a traditional attachment.

## Key Technical Details
- **Required Software:** NC Connector version 3.0.3 or higher (to resolve a known bug).
- **Configuration URL:** `https://nextcloud.uni-greifswald.de`
- **Authentication:** Uses "Login with Nextcloud (App-Password automatic loading)".
- **Critical Conflict:** Thunderbird's native "Offer to upload files larger than 5MB" setting (found under Settings $\rightarrow$ Composition $\rightarrow$ Attachments) must be **disabled** for the NC Connector's size limit detection to function correctly.

## Workflow
1. Install the `.xpi` file via Thunderbird's Add-ons Manager.
2. Configure the Nextcloud URL and authenticate via the browser.
3. Set the upload threshold and target folder in the "Sharing" tab.
4. When attaching a file exceeding the limit, the extension prompts for a Nextcloud upload and replaces the attachment with a link.
