Can I configure MailScanner to not check zip/archive files for only one domain?

In MailScanner Configuration > "Maximum Archive Depth = ", enter the name of a ruleset (e.g. %rules-dir%/archive.rules). Then save changes.

Create a file with that name in the /usr/mailscanner/etc/rules/ directory. This file should contain the following (replace domain.com with the domain you wish to skip scanning within archives for):

To: *@domain.com 0
FromOrTo: default 3

You must include the default line so MailScanner will know what to do with domains that are not specified.