How to find a bulk spam user

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cat /var/log/zimbra.log | sed -n 's/.*sasl_username=//p' | sort | uniq -c | sort -n
 1 Auser@domain.com
 3 Buser@domain.com
 4 Cuser@domain.com
 5 Duser@domain.com
 36 SPAMMER@domain.com

Ref:
https://wiki.zimbra.com/wiki/How_to_find_SMTP_Auth_user_names_to_find_out_bulk_spam_user

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