raw-paste-data.txt
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	jhathaway
	Jun 6 2022, 1:53 PM

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raw-paste-data.txt
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	#!/bin/bash

	set -o errexit
	set -o nounset
	set -o pipefail
	shopt -s lastpipe

	function join_by {
	local d=${1-} f=${2-}
	if shift 2; then
	printf %s "$f" "${@/#/$d}"
	fi
	}

	results=$(mktemp)
	cleanup() {
	rm "$results"
	}
	trap cleanup SIGINT SIGHUP SIGABRT EXIT

	declare -a addresses
	while read -r key _; do
	addresses+=("${key%:*}")
	done </etc/exim4/otrs_emails

	grep -E '=> ('"$(join_by '\|' "${addresses[@]}")"')' < <(zcat /var/log/exim4/mainlog.*.gz) >"$results"

	declare -Ai domain_names
	declare -Ai local_names
	for email in "${addresses[@]}"; do
	count=$(grep -c '=> '"$email" <"$results") \|\| true
	IFS='@' read -r local_name domain_name <<<"$email"
	local_names[$local_name]+=$count
	domain_names[$domain_name]+=$count
	done

	printf '\nTop Local Names:\n'
	for local_name in "${!local_names[@]}"; do
	printf '%d\t%s\n' "${local_names[$local_name]}" "$local_name"
	done \| sort -n \| tail -n 20

	printf '\nTop Domain Names:\n'
	for domain_name in "${!domain_names[@]}"; do
	printf '%d\t%s\n' "${domain_names[$domain_name]}" "$domain_name"
	done \| sort -n \| tail -n 20