--headers limit

[積丹尼 Dan Jacobson]

(info "(mailutils) Invoking Mail")
'-H'
'--headers'
     Print header summary to stdout and exit.

Mention how to print only the first 20 headers.
Mention how to print only the last 20 headers.

Not just with head(1) or tail(1).

That would mean still getting thousands of headers over IMAP.

mail (GNU Mailutils) 3.11.1
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