find all mails a user has received, $1 = To: email (sendmail)

find_mail.sh

#!/bin/sh

set -eu
export IFS='
'

TO=$1

for ID in $(grep to=\<"$1"\> /var/log/everything | awk '{print $6}'| tr -d : ); do

  FROM=$(grep "$ID" /var/log/everything | grep from= | cut -f2 -d\<|cut -f1 -d\>)
  echo $FROM '->' $TO

done