To send an email to the current user we have to follow some step I will mention them as follows
Step 1: Create a custom field on the account entity.
Step 2: Place this field on the account form so we can use it in workflow.
Step 3: Create a workflow on any entity you like but I am doing it on the account entity. This workflow will run on the demand.
Step 4: Add the step to update the field on the account entity we created in the above step. This step in to change the ModifyBy Field to the current user.
Step5: In this step we will send the email to the modifyby user because it will be the current user as we modify it in the last step.
Step 6: Save the workflow and activate it.
Step 7: Select the account and run the workflow on it.
Step 8: The workflow run successful and it created the email activity and the to field contain the current user.
