Currently SmarterMail has a blanket "Disable spam filtering on SMTP whitelisted addresses" option. Which IMO is silly... Some IPs we simply whitelist so they do not get IDS triggered, others we do not want any spam checks executed on, however, SmarterMail is all or nothing at this point.
Would be great to add another option to the IP whitelist called "Spam Filtering" next to the SMTP, POP, IMAP etc. options. So we can enable / disable spam checks per entry rather than a blanket option which really is useless.