List top sender address emails in zimbra

How to List top sender address emails in zimbra. From MTA zimbra, I will run command to list 6 sender address email zimbra.

The command as below:

cat /var/log/zimbra.log | awk -F 'from=<' '{print $2}' | awk -F'>' '{print $1}' | sed '/^$/d' | sort | uniq -c | sort -nk1 -r | sed -n '1,6p'

Note:
sed '/^$/d' : To delete only blank lines
sed -n '1,6p' : To print 1 line to 6 line.
awk -F 'from=<' '{print $2}' | awk -F'>' '{print $1}' : To print the email of sender address

Conclusion
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