Using MailEnable Enterprise 9.74 on Windows Server 2012 R2.
Since yesterday morning my server is being abused relaying countless spam emails.
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Relay settings are as following:
Allow Mail Relay - checked
Allow relay for authenticated senders - checked
Allow relay for priviledged IP ranges - unchecked
Allow relay for local sender addresses - unchecked
POP before SMTP authentication - checked (remember IP address for 30 minutes)
All of the time server receives SMTP Inbound connections from my public IP with some random Remote Domains and fake [SMTP:address]. also on SMTP Outbound connections i have dozens of connections on random IPs, and some have my postmaster as sender. All that makes no sense to me.
Any support appreciated