I realise that payslips are normally sent when you finalise a pay Run. --- BUT for one of my clients, the pay slips have to be sent by email manually. Why is this?

Hi info512, thanks for reaching out. This may be that the affected employee has not got email selected in the Default Pay Run Settings. If you could check this by opening up the employee details then selecting Default Pay Run Settings and under the Pay Slip Notifications tab please select 'Email' this could be the resolution. 

Cheers!