Go to Network and lock for rDNS
should be like
mail.example.com
or what ever your mail server name is..
it take some time to active (could take up to 24h, i think..)
Go to Network and lock for rDNS
should be like
mail.example.com
or what ever your mail server name is..
it take some time to active (could take up to 24h, i think..)