Internet TCP port 783 is primarily used by SpamAssassin, a mail filter software, for its spamd daemon. Spamd is a server process that uses this port to listen for connections and check messages for spam content. This port is not assigned by IANA for any specific service, but its use by SpamAssassin is widely recognized in the industry. Other software may also use this port, but such usage is not standardized.
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