In case you don't want to use your own mail app, you can use our mail server.

Navigate to ⚙️Settings - Client communication - Email Settings - and turn off "Send with iOS mail" or "Send with mail app"

Emails will be delivered to your customers from an email address invoices@mail.billdu.com with your business name displayed in front.
Replies will be routed to the email address of your account.

Your customers will receive an online link instead of a PDF file.

An email will contain a blue View invoice button. When clicked, an online link with the document opens. The online link gives an option to

Also there is a possibility to download a PDF file directly from the email.