awk '$3 ~ /^cwd/{print $3}' /var/log/exim_mainlog | sort | uniq -c | sed "s|^ *||g" | sort -nr
The above command will provide an output such as the below:
240 cwd=/var/spool/exim
20 cwd=/home/user
7 cwd=/home/user2
awk '$3 ~ /^cwd/{print $3}' /var/log/exim_mainlog | sort | uniq -c | sed "s|^ *||g" | sort -nr
240 cwd=/var/spool/exim
20 cwd=/home/user
7 cwd=/home/user2