In middle of 2001, I created mail server for multiple domains base on qmail:
qmail 1.03 ucspi-tcp 0.88 vpopmail 4.9.10 courier-imap 1.3.8.1
Relaying is enable only from our internal network (LAN) and few our public IPs. I'm using also enable after pop base on "open-smtp" in vpopmain/etc. I have on this server 23 domains with total ~ 21,000 mail boxes. Most (95%)of the mailboxes are accessible only by java mail on our LAN, the 95% users may use only the mail for inside our java application, they don't even know the mailbox real password. For 2 days I was logging network traffic on this server (huge files!) and I know the spam is coming direct from Internet to port 25, every 3 seconds I'm also appending "open-smtp" file to other log. The IP what I was looking for I have from spamcop reports (we are listed there).
The problem started just a few weeks ago. Did somebody found a method how hack qmail/vpopmail ???
Any idea ? Did anybody had a similar problem ? Any advice welcome.
Thank you, AST
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