RollerNet Help | Mail Deny List

The Roller Network Deny List filter is provided to allow you to restrict mail based on specific conditions. The following type of Deny List entries are provided:

Host (Single IP Address) - A single host IP address.
Host Name (DNS PTR) - Matches a host name (address->name) and its subdomains.
Network (CIDR Mask) - An entire CIDR network as calculated from the network and mask.
Sender Domain Name - Any sender who claims to be from a given domain (exact match).
Sender Domain Name w/Subdomains - Same as "Sender Domain Name" but includes subdomains.
Sender Email Address - Exact match on the sender address. Address extensions are not stripped.
Recipient Email Address - Exact match on the recipient address. Address extensions are not stripped.

If a match is found, then the message is acted upon immediately. The following actions can be taken against a Deny List match:

Tag - add the "X-Rollernet-DenyList" header and continue
Defer - return a 4xx defer message to the client
Reject - return a 5xx reject message to the client

We recommend that you reject or tag messages that match a Deny List entry. The SMTP message returned for a "reject" action is: "Client denied at the request of the recipient. Access denied." Tagging with the X-Rollernet-DenyList header can be used to filter the message into a "Junk" folder or other post-processing.

A wildcard for the Sender Email Address domain is allowed, but should be used with caution. The format is: example@*

You may choose to apply the block entry to a selected mail domain or all mail domains.

Bulk Entry Mode

The Deny List includes a bulk entry mode to facilitate adding multiple entries of any supported type. Like single entry mode, select an action and domain to apply the entries to. However, the system will automatically detect the entry type based on the following rules:

If the entry line is an IP address, add as "Host (Single IP Address)"
If the entry line is an IP address with a CIDR slash-mask, add as "Network (CIDR Mask)"
If the entry is a valid domain name, add as "Sender Domain Name"
If the entry is a valid email address AND it is a mail domain, add as "Recipient Email Address"
If the entry is a valid email address AND NOT a mail domain, add as "Sender Email Address"
If the entry begins with "*." (i.e. *.example.com), add as "Host Name (DNS PTR)"
If the entry begins with "." (i.e. .example.com), add as "Sender Domain Name w/Subdomains"

If an error is detected, it will be indicated by line number. Blank lines will be ignored. Wildcard domain sender email address entries are not supported in bulk entry mode.