Become superuser or assume an equivalent role.
Roles contain authorizations and privileged commands. For more information about roles, see Configuring RBAC (Task Map) in System Administration Guide: Security Services.
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 email@example.com, such as a host name.
Alternately, you can run a subset of the mail queue with -qInnnnn.
# /usr/lib/sendmail -qInnnnn
Use a queue ID.