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Cloudmark Cartridge Installation and Administration Guide Chapter 5
26 Envelope whitelisting
Note that email address strings contain a leading less than sign (<) and trailing
greater than sign (>). Either of the following examples can be used when
searching for an explicit email address (for both header and envelope
whitelisting):
type=envelope; command=[rcpt to]; value=[<user@domain\.com>$];
type=envelope; command=[rcpt to]; value=[\buser@domain\.com$];
Suppose that you want to configure a more complex rule to allow mail from the
following domain:
user@domain.com
user@primary.domain.com
user@secondary.domain.com
but explicitly exclude:
user@machine.primary.domain.com.
A suitable rule could look like:
type=envelope; command=[rcpt to]; value=[@([^.]*\.domain|domain)\.com\b];