MailChannels Outbound Filtering is a cloud-based SMTP relay service designed for web hosting providers to manage and secure outbound email traffic from their customers' servers. The service routes outbound email through intelligent IP pools to maintain sender reputation and avoid blacklisting, improving inbox delivery rates for hosted customers. Core capabilities include: - Built-in spam and phishing detection to block outbound malicious or unwanted email before delivery - Compromised account detection by identifying spam-like trends in outgoing email streams - Automated account shutdown via API webhooks when abusive sending behavior is detected - Monitoring alerts that notify administrators of spamming activity within the hosting network - False positive remediation through the MailChannels Insights™ tool, allowing users to self-resolve delivery issues - Log search and analytics for diagnosing email delivery problems - Top Senders report showing volume, spam detections, and rejections to identify spammers and compromised accounts - Support for multiple SMTP authentication passwords per account, enabling credential rotation - Multi-user web console with role-based access levels for hosting support teams - Sender profiles displaying sent mail history, alerts, and metrics The product requires no hardware or software installation, operating entirely as a cloud service. It is marketed toward shared hosting providers and is used by companies including Hostinger, WP Engine, DreamHost, Namecheap, and Kinsta. MailChannels states GDPR compliance and is pursuing SOC 2 Type II certification.