On 2017-09-11 14:13:29 (+0200), Davide Marchi wrote:
activating a backup server I realized that some spammers using this
server to send spam to my relay_recipient_maps addresses. Spam is then
successfully forwarded to the main server.
Is there a parameter to prevent this type of action? A type check "do
not receive email if the main server is reachable...?
Or should I operate directly by SpamAssassin?
Your backup servers should have the same filtering in place as your main
server. If not, spam will sneak through.
For a simple setup, a separate backup server will often do more harm
than good.
If you're using postscreen and you have multiple IP addresses
configured,, you should investigate the
``postscreen_whitelist_interfaces`` option to give spammers who try
backup MXes a hard time.
Last time I checked, it was not possible to share the postscreen
temporary whitelist between machines.
Philip
--
Philip Paeps
Senior Reality Engineer
Ministry of Information
