The Mutt E-Mail Client : Reference : Configuration variables : in_reply_to
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## 6.3.72. in_reply_to

Type: string
Default: "%i; from %a on %{!%a, %b %d, %Y at %I:%M:%S%p %Z}"

This specifies the format of the In-Reply-To header field added when replying to a message. For a ful llisting of defined escape sequences, see the section on index_format.

Note: Don't use any sequences in this format string which may include 8-bit characters. Using such escape sequences may lead to bad headers.

The Mutt E-Mail Client : Reference : Configuration variables : in_reply_to
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