Home ยป Is it possible to create a Gmail filter that works on headers other than From, To, Subject?

Is it possible to create a Gmail filter that works on headers other than From, To, Subject?


Yes, you can filter by “Delivered-To”. Just create a new filter with deliveredto:youremail@address.com in the has the words field.

๐Ÿ›ˆ Note that the “has” filter name doesn’t have “-” in its name as opposed to the original email header name.

  1. go to https://script.google.com and create a new Google Apps Script

new google apps script.

  1. select the “Create script for Gmail” option

    • this will create a script project
    • this will create a script called Code.gs
    • this will create sample functions, one them named processInbox
  2. save the project

  3. customize the script and test it until you are satisfied
  4. find the “custom project’s triggers” button

    custom trigger button

    • this will let you run the script on a timer (e.g. daily, or every minute)



This function will iterate over all messages in the Inbox.

function processInbox() {
   // process all recent threads in the Inbox (see comment to this answer)
   var threads = GmailApp.search("newer_than:1h");
   for (var i = 0; i < threads.length; i++) {
      // get all messages in a given thread
      var messages = threads[i].getMessages();
      for (var j = 0; j < messages.length; j++) {
         var message = messages[j];

Go one step further and call GmailApp.search() if you want to do something fancy instead of GmailApp.getInboxThreads().


This function will take care of processing a single message; you get the raw content with getRawContent() and try to find your header in there, if it is in there, tag the message.

function processMessage(message) {
  var body = message.getRawContent();
  if (body.indexOf("X-Custom-Header: some-custom-value") > -1) {
    // do stuff with message (e.g. add label)

Here is a list of all the advanced operators:

– (hyphen)
” ” (quotes)
( )
+ (plus sign)


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