如何像Thunderbird一样使用过滤器迁移邮件？

I’ve run into similar headaches before, so here are a few actionable paths to solve your problem:

1. Convert Thunderbird’s msgFilterRules.dat to Gmail-Compatible XML #

Thunderbird’s filter file is plain text (not XML), but you can convert it to the structure Gmail accepts for filter imports. Here’s how:

• Use a conversion tool: Look for open-source scripts or lightweight utilities that parse msgFilterRules.dat and output Gmail’s filter XML format. These tools typically map Thunderbird’s "move to folder" actions to Gmail’s labels (since Gmail uses labels as its version of folders).
• Manual conversion (if tools aren’t available): Open the .dat file in a text editor—each filter is defined in sections starting with filterName. For each rule:
  • Extract criteria (e.g., from:"john@example.com" translates directly to Gmail’s from filter condition)
  • Map "move to folder" to a Gmail label (you’ll need to create the target label in Gmail first)
  • Build an XML file following Gmail’s filter structure (export an existing Gmail filter to get a template)
• Once you have the XML file, go to Gmail > Settings > Filters and Blocked Addresses > Import filters to upload it.

2. Use Gmail API Correctly to Create Filters with Label (Folder) Assignments #

You’re right that the API docs can be tricky to navigate, but the users.settings.filters.create endpoint does support moving messages to "folders" (labels in Gmail):

• First, retrieve the ID of your target label using the users.labels.list endpoint (this gives you the unique id for the label you want to move messages to)
• When creating a filter via API, define:
  • criteria: The conditions for the filter (e.g., from, subject, hasAttachment)
  • action: Set addLabelIds to the label ID you retrieved (this moves the message to that label/folder). You can also add removeLabelIds with INBOX to take it out of the main inbox if needed.

Example payload snippet:

{
  "criteria": {
    "from": "client@example.com"
  },
  "action": {
    "addLabelIds": ["Label_1234567890"],
    "removeLabelIds": ["INBOX"]
  }
}

3. Use a Middleman Email Client for Syncing #

If you don’t want to deal with conversion or API code, try using an email client that supports both Thunderbird filter imports and Gmail sync:

• Import your Thunderbird filters into the client (many modern clients support importing .dat files)
• Configure the client to sync with your Gmail account
• For each imported filter, adjust the "move to folder" action to target the corresponding Gmail label (the client will sync this rule to Gmail)

内容的提问来源于stack exchange，提问作者Nicolas Calderon