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Old 22 Nov 2018, 02:33 PM   #2
Intergalactic Postmaster
Join Date: May 2004
Location: Irving, Texas
Posts: 8,578
Sure - this works fine. For example, the following search examines the headers to locate all messages containing pdf attachments:
header:"X-Attached: pdf"
The Advanced search... > Anywhere field searches anywhere in the raw message. See Fastmail Help for more details.

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