https://portal.smartertools.com/community/a88670/security-question-issue-each-minute-foreign-ip-address-is-trying-to-ehlo-authentificate.aspx
Security question/issue: Each minute foreign IP address is trying to EHLO, and authentificate my...
I have found under SMTP log events that each minute a foreign ip is trying to authentificate my domain.Any idea what is happening, and perhaps what...