Lately been having issues with Grey listing, when customers email us from Office 365 takes ages untill its arrives.
So we decieded to start using Grey listing white listing.
let start
Step 1.
let create a file called clients_fqdn_whitelist.local on the sqlgrey listing
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/etc/sqlgrey/clients_fqdn_whitelist.locallet add the domains that will not be added to the sqlgrey listing scan
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Domain.com
domain.net
jamesbond.comrun sudo update_sqlgrey_config after add the domains to the list
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sudo update_sqlgrey_configthis is very important step to get the sql database check the domains. you have to restart the sqlgrey
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sudo systemctl restart sqlgreyif you have any questions let us know.