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Set trusted/denied IPs for SMTP (IP Access list)

It's very simple to add trusted IPs for your entire domain, after having logged to

Right after logging in, hover your mouse on top of Filtering and choose IP Access Lists.

Simply click on the NEW button, choose Preference blacklist or whitelist and add an IP which you want to blacklist or whitelist in the Value field. You may specify a single IP or an IP range using CIDR notation, for example:

This is a type of black/whitelist based on IPs. If you specify an IP or IP range as whitelist, for example, e-mails sent from such locations will never be marked as spam, for all your domain's e-mail accounts.

On the other hand, if you choose blacklist, connections coming from the servers whose IP you specified will be refused.