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Minger Email Verification
Minger is a lightweight protocol used primarily with email servers to verify the existence and validity of email addresses without initiating full SMTP transactions. Designed originally for integration with the MDaemon Email Server, it helps email systems quickly validate addresses to minimize bounce rates and improve efficiency in mail routing..
Minger (Mail Identifier Gathering for Email Rejection) is a protocol primarily used for verifying email addresses across different servers within the same organization or federation. Instead of relying on a full SMTP connection to perform user lookup, Minger provides a method to query the existence and status of an email recipient. This reduces overhead, cuts down on unnecessary SMTP traffic, and allows quicker decision-making by mail servers.
Typically, Minger operates over UDP port 4069 to provide fast, low-latency queries. A client server sends a UDP packet containing the email address in question to the Minger server, which responds with a simple message indicating if the address exists or not. Since the responses are lightweight, this process enhances performance when compared to conventional methods like SMTP VRFY.
Minger was developed primarily by Alt-N Technologies for its MDaemon Email Server ecosystem, but the protocol's simplicity allows it to be adopted by other compatible mail transfer agents. Despite its narrow adoption, it serves a specific niche for rapid, efficient intra-organization email validation without exposing full user details or requiring encrypted connections.