Recieving Mail restrictions

[russeder]

Hi All
I'm hoping you can help me, I have spoken to our ISP and they are telling us that we are 1 of many companies being targeted with the Neskey virus, They are telling me to set my server to recieve mails only to the people in the company. I am a bit confussed with what she is saying here.... ????????????????

 

[zbnet]

They're suggesting you implement some sort of 'whitelist' functionality, where you test each incoming email and only accept it if it is addressed to an existing address (ie an SMTP address that is owned as a proxy by one of your mailboxes or DLs).

Unfortunately, you don't have this feature in out-of-the-box 5.5, you need 3rd party software to achieve this. Xwall and Mail Sweeper are two such products that enable you to implement this, there may be others as well.