[vps-mail] Filtering Service IP Subnets for virtual SMTP?

["Martin Fischer" <martin.fischer@xxxxxxxxxxxxx>]

Hi, 

for blocking direct delivery to SMTP we want to make use of 
filtering service i.e. only a certain IP may send mail to 
our virtual SMTPs. 

We would need advice how to configure IP blocking for 
subhosted domains?

Thanks a lot for any hints!

BR

martin

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