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--- how_to:rbl_checking_not_working_in_vpop3_enterprise [2011/05/09 08:45] – created paul
+++ how_to:rbl_checking_not_working_in_vpop3_enterprise [2018/11/14 10:45] (current) – external edit 127.0.0.1
@@ Line 9: / Line 9: @@
   * if you get your incoming mail feed via a proxy server, eg a security appliance, then RBL can't work
   * if the VPOP3 PC isn't configured to use a working DNS server, then RBL can't work
+In the first three cases above, the server/device which is first receiving the incoming SMTP mail should do the RBL testing, because the RBL testing has to be done by the server/device which receives the mail from the last 'untrusted' server.
 If you go to Settings -> Diagnostics, and set 'Log Level' to 'Full Logging', then look in the VPOP3.LOG file after you have had an incoming SMTP message, you should see lines containing with "Test RBL Server <server> <address being looked up> FOUND|NOT FOUND". Those will show what RBL checks VPOP3 is doing, and what the results were.

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