How to Organise Your Email with Folders and Filters in Thunderbird

This guide shows you how to keep a busy mailbox under control in Mozilla Thunderbird using five built-in tools: folders to file your mail, message filters to sort incoming mail automatically, tags (older versions called them labels) to colour-code messages, saved searches to build living views across folders, and the archive to clear the inbox without deleting anything. It is written for Noiz clients whose mailbox is hosted on the Noiz mail platform and connected to Thunderbird over IMAP. The emphasis here is on the decisions that matter on hosted, synced mail, especially the difference between folders that live on the server and folders that live only on your computer, because that single distinction changes what everyone else sees.

Last reviewed: 27 July 2026, against Thunderbird 140 (the current monthly Release; the parallel ESR track behaves the same for these features). This guide is written for Noiz hosting and is kept current against Thunderbird. It complements, and does not replace, the official Thunderbird documentation linked below. Thunderbird's menus move slightly between versions, so if a label or path differs from what you see, the concept still applies and the official pages below carry the exact current wording.

Official Documentation Reference

• Organizing your messages using Filters (Mozilla Support): the official reference for the Message Filters dialog, including every condition and action.
• Archived Messages (Mozilla Support): the official explanation of the Archive button and Archive Options.
• Thunderbird Support (Mozilla Support): the full support hub, covering folders, tags, search folders and the current interface for your exact version.

Prerequisites

• Your Noiz mailbox already added as an account in Thunderbird over IMAP. Almost everything below depends on that IMAP connection. Thunderbird's autoconfig often cannot find custom-domain settings, so if the account is not yet set up you will usually enter the server details by hand: incoming IMAP host mail.yourdomain.com, port 993, SSL/TLS; outgoing SMTP host mail.yourdomain.com, port 465, SSL/TLS; username the full email address; normal password authentication. Replace yourdomain.com with your own domain.
• An actual mailbox to organise. If you have not yet created the mailbox on the Noiz platform, do that first.

The One Thing to Understand First: Server Folders vs Local Folders

Before you create a single folder, it is worth understanding where a folder actually lives, because this is the source of most confusion with hosted mail.

In the folder pane on the left, your Noiz mailbox appears as an account named after your email address, and below all your accounts there is a separate account called Local Folders. The two behave very differently:

• Folders under your Noiz account are IMAP folders. They live on the Noiz mail server. Anything you do to them is synced back: create a folder and it appears in webmail and on your phone; move a message into one and it moves there everywhere. This is usually what you want, because your filing follows you across every device.
• Folders under Local Folders live only on this computer. They are stored in Thunderbird's profile on your hard drive and are never uploaded. Nobody else sees them, they are not in webmail, and they are not on your phone. They also are not part of any Noiz backup of your mailbox, because the server never receives them.

The gotcha to keep front of mind: a folder you create under your IMAP account is a real folder on the Noiz server, so it turns up in the Noiz webmail folder list too, exactly as you named it. If you would rather webmail stayed tidy, keep your filing structure deliberate, because it is shared. Conversely, moving a message into a Local Folder quietly pulls it off the server, so it disappears from webmail and from your other devices. That can be exactly what you want (to free server space) or a nasty surprise (mail you thought was safely filed is now on one laptop only). Decide on purpose.

Create and Manage Folders

Create a New Folder

1. In the folder pane, right-click the account or the parent folder you want the new folder to sit inside. Right-click your Noiz account name to create a top-level folder on the server, or right-click Local Folders to create one only on this computer.
2. Choose New Folder.
3. In the New Folder dialog, type a name, confirm the Create as a subfolder of location, and click Create Folder.

A folder created under the Noiz account is created on the server immediately and will appear in webmail within moments. Renaming or deleting an IMAP folder in Thunderbird likewise renames or deletes it on the server for every device, so treat those actions with the same care you would in webmail.

If a Server Folder Is Missing: Subscribe to It

With IMAP, Thunderbird only shows the server folders you are subscribed to. If a folder exists in webmail but is not visible in Thunderbird, right-click your Noiz account name and choose Subscribe. Tick the folders you want Thunderbird to show and sync, then click OK. This is the usual fix when a folder created elsewhere, or on another device, does not appear.

Message Filters: Sort Incoming Mail Automatically

A message filter is a rule that Thunderbird applies to mail as it arrives (or on demand): if a message matches your conditions, Thunderbird performs the actions you chose, such as moving it to a folder, tagging it, flagging it, or forwarding it.

Important distinction for hosted mail: Thunderbird filters run on your computer, inside Thunderbird, only while Thunderbird is open and collecting mail. They are not the same as server-side rules. If you want mail sorted even when Thunderbird is closed, or the same sorting to apply on your phone and in webmail, that has to be done as a server-side rule in the Noiz webmail settings instead. Thunderbird filters are perfect for how one person works at one desk; they are not a mailbox-wide policy.

Open the Message Filters Dialog

1. Click the app menu button (the three-line menu, top-right) and choose Message Filters. If you keep the classic menu bar visible, Tools > Message Filters does the same thing.
2. At the top of the dialog, set Filters for to your Noiz account. Filters belong to a specific account, so choose the right one.

Create a Filter

1. Click New. The Filter Rules window opens.
2. Give the filter a clear Filter name, for example Invoices to Accounts folder.
3. Under Apply filter when, tick when it should run. Getting New Mail handles incoming mail automatically; Manually Run lets you trigger it yourself later; other options cover archiving and after sending. You can tick more than one.
4. Choose how conditions combine: Match all of the following (every condition must be true), Match any of the following (any one is enough), or Match all messages.
5. Build each condition from the three dropdowns: a property (such as From, Subject, To, To or Cc, Body, Date or Age in Days), a test (such as contains, is, begins with), and a value. Use the + button to add more conditions.
6. Under Perform these actions, choose what to do. Common choices are Move Message to or Copy Message to a folder, Add Tag, Mark As (read or starred), Set Priority, Forward Message to an address, and Delete Message. You can add several actions, and Stop Filter Execution tells Thunderbird to run no further filters on that message.
7. Click OK to save the filter.

Where the action sends the mail matters. If a filter moves a message into a folder under your Noiz account, it moves on the server and stays visible in webmail and on your phone. If it moves the message into a Local Folder, it leaves the server, so it vanishes from webmail and your other devices even though the filter looks like it just tidied your inbox. Pick the destination with the earlier section in mind.

Filter Order and Running Filters by Hand

Filters run from top to bottom in the list, so order matters. Select a filter and use the up and down controls to reorder it, and remember that a Stop Filter Execution action ends processing for that message at that point.

To apply filters to mail that is already sitting in a folder (for example after you create a new rule), select the folder, then at the bottom of the Message Filters dialog set Run selected filter(s) on to that folder and click Run Now. You can also right-click a folder and use the run-filters option, or select messages and apply filters to just those.

Tags: Colour-Code Without Moving Anything

Tags let you label a message (Important, Work, and so on) with a colour, without moving it out of its folder. A message can carry several tags at once, which is their advantage over folders: a mail can be both Work and To Do without you having to choose one folder for it.

Apply and Remove Tags

• Select one or more messages and press a number key 1 to 9 to apply the matching tag; press 0 to clear all tags from the selection.
• Or right-click the message, open the Tag submenu, and pick a tag. The same submenu removes tags.

Create Your Own Tags and Colours

1. Open the app menu > Settings and go to the General panel.
2. Scroll to the Tags section. Here you can Add a tag, edit or delete existing ones, and set each tag's colour.
3. The order tags appear in this list is the order the number keys map to, so put the tags you use most at the top.

Do tags sync to webmail? Partly. Thunderbird stores tags as IMAP keywords on the server, so the fact that a message is tagged does travel with the message. However, the Noiz webmail interface and other mail apps will not necessarily show your tag names and colours the same way Thunderbird does; the built-in tags map to standard keywords, while custom tag names may appear only as plain keyword text elsewhere. Treat tags as a Thunderbird-first organising tool that mostly, but not perfectly, carries across.

Saved Searches: Living Views Across Folders

A saved search (also called a search folder or virtual folder) looks like a folder in the pane, but it holds no mail of its own. Instead it shows every message, wherever it is filed, that matches criteria you set. Nothing is moved or copied, so a saved search is completely non-destructive and never changes what webmail shows.

They are ideal for questions like "every unread message tagged Important across all my folders" or "everything from one client, wherever I filed it".

1. Right-click your Noiz account name and choose New > Saved Search (the classic menu bar route is File > New > Saved Search).
2. Name the search and confirm where it should appear in the pane.
3. Under Search for messages which match, build conditions exactly as you did for filters (match all or any, then property, test and value).
4. Click Choose and tick the folders to include; tick the option to search subfolders if you want the whole tree covered.
5. Click OK. The saved search appears in the folder pane with a search-folder icon and updates itself as matching mail arrives.

Because a saved search is only a view, deleting it deletes the view, not the messages. The real mail stays exactly where it was filed.

The Archive: Clear the Inbox Without Deleting

Archiving moves a message out of the inbox and into a dated Archives folder, so your inbox shows only live items while nothing is thrown away. Select one or more messages and click the Archive button in the message toolbar, or press the A key.

On your IMAP-connected Noiz account the Archives folder is a folder on the server. That has two consequences worth knowing:

• Archived mail is still on the server, so it appears in webmail and on your phone, and it still counts towards your Noiz mailbox quota. Archiving tidies the inbox; it does not free up mailbox space and it is not a backup.
• If your goal is to reduce what is stored on the server (for quota reasons), that means moving mail into a Local Folder instead, which removes it from the server. Accept the trade-off from the first section: that mail then lives only on this computer and leaves webmail and your other devices.

Set How the Archive Is Organised

1. Right-click your Noiz account name and choose Settings to open Account Settings.
2. Go to Copies & Folders and find the Message Archives section. Confirm Keep message archives in points at the Archives folder you want.
3. Click Archive Options. Choose how archives are grouped: a single folder, yearly folders (for example Archives/2026), or monthly folders. You can also tick the option to keep the original folder structure of archived messages, so a message archived from a subfolder lands in a matching path inside Archives.
4. Click OK.

Troubleshooting

• Symptom: a folder you created in Thunderbird shows up in webmail and you did not expect it. That folder is under your IMAP account, so it is a real server folder shared everywhere. If you wanted it private to this computer, create it under Local Folders instead and move the contents across (accepting that it then leaves the server).
• Symptom: a filter is not running. Check that Getting New Mail is ticked in the filter, that the filter is enabled (its checkbox in the list), that it belongs to the correct account in Filters for, and remember filters only run while Thunderbird is open. For mail sorted around the clock, use a server-side rule in Noiz webmail instead.
• Symptom: filtered mail seems to have disappeared from webmail and your phone. The filter is moving messages into a Local Folder, which removes them from the server. Edit the filter's Move Message to action to point at a folder under your Noiz account so filing stays synced.
• Symptom: a server folder exists in webmail but not in Thunderbird. Right-click your account, choose Subscribe, and tick the missing folder.
• Symptom: your mailbox is over quota even though you have been archiving. Archiving keeps mail on the server, so it still counts. Empty the Trash, and for anything you must keep but do not need on the server, move it into a Local Folder or export it, understanding it then lives only on that computer.
• Symptom: tags you applied in Thunderbird look different or missing in webmail. Tag keywords sync, but names and colours are a Thunderbird presentation; other clients may show custom tags as plain keyword text or not at all. This is expected, not a fault.

If you get stuck, open a support ticket with the Noiz support team. Include your email address, whether the folder in question is under your account (IMAP) or Local Folders, and a screenshot of your folder pane or the filter or archive setting you are working on, and Noiz will help you get it sorted.