Securing MDaemon.
Website: http://www.deerfield.com/products/mdaemon/
Information provided by: Joe Jared
Additional Information: In Setup -> Security Settings -> IP shielding -> Pop before SMTP
Check "Local sender must have accessed mailbox within the last X minutes".

If your version does not support pop before SMTP, you cannot secure it. (Any other configuration suggested will be a kludge designed to get around DNSbl sites.)

 
   
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