Block a user
Multi-domain virtual hosting
Webmail UI (separate project)
Deliverability testing (SPF/DKIM/DMARC pass verification)
rspamd milter integration (optional)
Connection-level blocklist (IP deny list)
Rate limiting on SMTP connections
Log shipping / structured access logs
Metrics endpoint (Prometheus)
Alias support (forward
info@ → real mailbox)
Admin HTTP API (manage domains, mailboxes, aliases)
DNSBL checks on inbound connections (basic blocklist)
Reject or quarantine based on DMARC policy
DMARC policy parsing and enforcement