To praise someone or something formally for doing well.
“I would like to commend your staff for their outstanding customer service.”
“I want to commend the organizers for such a well-run event.”
'Commend' fits CELPIP Writing Task 1 emails praising an employee, service, or event, such as writing to a manager about a staff member's excellent work. It sounds more formal and specific than 'praise,' which suits the professional register these emails usually require.
Synonyms: praise, compliment, applaud