You use this command to force a substring of an address, such as a host name, to be processed. You also use this procedure to force a particular message from the queue.
You will have to become an administrator. For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.4.
You can then use the following command to run a subset of the mail queue at any time with –qRstring.
# /usr/lib/sendmail -qRstring
Use a recipient's alias or a substring of user@host.domain, such as a host name
Alternatively, you can use the following command to run a subset of the mail queue with –qInnnnn.
# /usr/lib/sendmail -qInnnnn
Use a queue ID