Internet TCP port 4190 is primarily used by the Sieve mail filtering language. This protocol is utilized by software such as Dovecot, an open-source IMAP and POP3 email server for Linux/UNIX-like systems. Sieve scripts allow users to filter incoming email on the mail server. The ManageSieve protocol, which operates on port 4190, allows users to manage their Sieve scripts in a centralized way.
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