RFC 5322 Message-ID Generator
Building an MTA or a programmatic sender? Every outbound message needs a unique Message-ID; this tool gives you a spec-compliant one.
Made it. Now see what happens after you send.
Outsolvi tracks your email once it leaves your outbox: which opens were a person and which were a machine, who clicked, and who replied. Follow-ups stop on their own when someone answers. Outlook and Gmail, from $7/user/mo billed yearly.
Track your next sendGenerates Message-ID in the form <random-id@your-domain>. Validates the format. Explains why both halves matter (uniqueness and routing).
Building a sending system from scratch. Diagnosing duplicate-Message-ID problems in an existing system.
FAQ
Can I just use a UUID?+
Yes, with @your-domain appended. UUID v4 plus your sending domain is RFC-compliant and globally unique.
Keep going
Articles, glossary entries, and other tools on the same topic.
Nate built Outsolvi after watching every email-tracking tool he had ever used lie to him about opens. Outsolvi grades every open as a person or a machine, in Outlook and Gmail, so the number on the dashboard is one a rep can actually act on.
We update these pages when the underlying mechanics change. new mailbox-provider rules, new tracker behavior, new measurement gaps. The dates above are real revisions, not auto-touches.