To ensure that your employees are receiving their payslip notifications via email, follow these simple steps:
You can then test this by re-sending the payslips to individual or all employee's to make sure this work around has fixed the issue. You can do so by clicking here.
It can also be best to check that the employee's mail address are setup correctly such as spelling and format under Employee Details. Let us know how you go and if you still have any issues.