ReputeCast is a free, open-source, self-hosted newsletter platform built around deliverability. Before you send, it checks 80+ blocklists, SPF/DKIM/DMARC/BIMI, spam triggers, Gmail clipping, broken links and list quality, then gives Pass, Warn or Block with a fix. While sending, it watches bounces and complaints and pauses risky routes. Send via your own SES, Postmark, Mailgun, SendGrid, Resend, Postal or SMTP, with failover.
