A network administrator notices that there are a high number of queries to the LDAP server. The mail logs show an entry "550 Too many invalid recipients | Connection closed by foreign host." Which feature must be used to address this?

Question

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SMTP is used to send emails. The error message "550 Too many invalid recipients | Connection closed by foreign host" indicates that the SMTP server is rejecting emails due to too many invalid recipients.

A Network Administrator Notices That There Are a High Number