MailMum for CTOs & Heads of Infrastructure

Mail security shouldn’t run through a black box you don’t control. MailMum is a self-hosted, privately-managed DNSBL platform — the lists, the logging, and the audit trail belong to your organization, not to a shared, global reputation database.

Why infrastructure leaders choose MailMum

• No dependency on an external reputation vendor for a core piece of mail security. Your blacklist/whitelist policy is entirely yours to define and change.
• A durable audit log for every inbound connection attempt your mail servers evaluated — source IP, destination server, pass/block status, and timestamp, retained as a permanent record.
• Real traffic data, not vendor dashboards. Blocked-vs-passed traffic, hourly request volume, and blacklist match counts per server and account give you evidence to justify infrastructure and security spend.
• Useful for incident response and compliance evidence, without having to correlate logs across multiple third-party systems.

What it doesn’t do

MailMum is not a Mail Transfer Agent, not a content/spam filter, and not a firewall — it answers a single DNS question (“is this IP allowed to talk to this server?”) that your existing MTA already asks. See what MailMum is not for the full picture.

Rolling it out

Setup is a standard RBL integration on the mail-server side — see the MailMum documentation for Postfix, Exim, and other systems. For the reasoning behind the architecture, read the MailMum Whitepaper.