I have the Spam Blocker on my Untangle box set to only "Mark" spam messages, but on occasion it seems to "Drop" a few.
Settings are set to "Scan SMTP" only (POP and IMAP unchecked). Drop Super Spam is unchecked, Enable Tarpitting is unchecked, Scan outbound (WAN) SMTP is unchecked. The only box checked is Close connection on scan failure.
What do I need to do to make sure that Untangle never drops a message? What exactly does drop mean? Does it bounce a message back to sender or does the sender receive a warning?
Two of messages that were dropped today look legitimate, so I want to make sure that the sender at least received a warning.