Search within a technical header

How it works

header: followed by a header name and its value separates the two with a colon: header:X-Google-Calendar-Notification:rsvpWithNote.

Examples

• header:X-Google-Calendar-Notification:rsvpWithNoteOpen in Gmail ↗

  Messages whose header has this value.

What it does well

• Gives access to information no other operator exposes, such as the notifications of a specific tool.

What it does badly

• The help page gives a single example and doesn't say which headers are actually indexed.Not documented by Google · Gmail Help: search operators

See also

• rfc822msgid:Finds a single message using the Message-ID of its header.
• list:Finds messages that come from a mailing list.