Sellsy allows you to easily send late reminders to your clients.
If you have to send several reminders, for your late invoices for example, it's really simple:
From the invoice list, select the ones you need on the left of the column:
Then choose the option Remind by email.
Note: the system uses by default the general reminder system of your account that you can edit in Settings > Sellsy Add-on > Sales Management > Email system.