Thunderbird Limit Email Download ((install)) May 2026

This is the most effective way to prevent Thunderbird from fetching years of old messages while keeping recent emails available offline.

You can prevent large attachments from downloading automatically to save bandwidth and storage.

Thunderbird defaults to downloading all emails for offline access, which can quickly consume gigabytes of disk space and slow down your computer. To manage this, you can limit email downloads by , file size , or specific folders . 1. Limit Downloads by Age (Synchronization) thunderbird limit email download

: In the "Disk Space" section, check Synchronize the most recent and enter a value (e.g., 30 days or 1 year).

Can I limit messages to a recent time period? - Mozilla Support This is the most effective way to prevent

: Click Synchronization & Storage in the left sidebar.

: Right-click your email account in the left pane and select Settings , or go to Tools > Account Settings . To manage this, you can limit email downloads

: Thunderbird will still download message headers (subject and sender) for all emails so you can see them in your list, but it won't download the full content until you click on them. 2. Limit Downloads by Message Size