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The digest by default removed non-essential headers like ‘In-Reply-To:’ from messages. Modern MUAs, like Mutt can split out messages from a digest and then thread them based on such headers. To include these and all other headers in the digest messages, use the ‘v’ or ‘n’ format as described on the ezmlm-get(1) man page. Normally, the threading done by ezmlm is sufficient and the default format preferred to reduce message and digest size, often by 25% or more.