I'm trying to find the reason for the constant flow of error messages in the mail error log.
"March 28 10:29:51 auth: error: od (lindsay, 18.104.22.168,): check in clear: the search failed for the user: Lindsay"
For the above error, the IP address is on everyone's blacklist. In the mail configuration, I activated blacklist filtering checked, entered "zen.spamhaus.org". The user "Lindsay" is a valid user although not being a current employee (his email account is transferred to another employee).
Does blacklist filtering reject this message?
OS 10.12.6, server 5.3.1