What are some alternatives?
When comparing Spamihilator and dmarcian, you can also consider the following products
Mailwasher - Over 8 million people use MailWasher as their spam filter
Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.
Spamfence.net - Professional e-mail security free for private use: With Spamfence.
Virtru - Virtru is your data privacy force field, wrapping and protecting emails and files wherever they're shared. Easy-to-use data security software for business. People also askIs Virtru Hipaa compliant?
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
Mimecast Gateway - Mimecast Gateway is a SaaS-based email security solution that uses sophisticated, multi-layered detection engines and intelligence to protect email data and employees from malware, spam, advanced threats and zero-day attacks.