Small businesses have multiple affordable DMARC alternatives. Options include free services like Valimail and Postmark, DIY solutions such as `parsedmarc` and open-source tools highlighted by DMARC.org, EasyDMARC offers affordable plans tailored for smaller companies, and tools like MXToolbox & Mail-tester can also be leveraged. Paid services (such as URIports) provide more comprehensive management, while understanding DMARC reports via resources from Google, Microsoft and the DMARC RFC is essential. Experts caution that in-house management requires technical skills and time investment, potentially making managed services a better option for some.