It's unfortunately out of our control to not have them blocked by the employees email providers.

1. Navigate to the Employees section.
2. Click on the name of the employee.
3. Click on Pay Run Defaults from the left.
4. Scroll down to Pay Slip Notifications, and set it to None.
5. Click Save.
6. Change the setting for Pay Slip Notifications back to Email.
7. Hit Save again.
8. Try sending the pay slip via email again.

It's also possible that the employers email is being blocked due to the nature of the system. You should add        as your from email address email under Payroll settings > Payslips.

They should also ensure that the email   is  added as a safe sender to the employees emails.

 There is another more reliable option also. The employee portal provides password protected real time access to payslips for your employees and it is complimentary service. Employees can then accept the invitation, set up a password and can access and download any payslip they have ever been provided with from the Payroll system. Payslips are available to an employee even after termination.

As a reminder, make sure that your employees' email addresses are correctly setup under their individual settings.