As a default settings, our Billdu app sends documents from our mailing server. That means they come from our email address We also display your business name.

Example of an invoice in Gmail

If your customer doesn't want to open the link, by clicking on "Click here to download PDF" a PDF file is downloaded directly.

The email message comes with a blue View invoice button. When clicked, a window with your invoice opens. Your customer can download a PDF file, pay the invoice, (if you use online payments), create a delivery note, accept an estimate/quote or print it out.

When you send your documents with Billdu, you'll find it in your Inbox. The replies of your customers and all communication appears in the Inbox like a chat. If you don't read your inbox message, we send you an email with the message within 5 minutes.

If your client uses Billdu, the Inbox operates as chat or messenger. You can chat with your client, send documents, videos, images or photos.



  • All conversations in one place

  • Pay now button for invoices

  • Accept button for estimates/quotes

  • Notifications

  • Easy - works like a chat

  • PDF file download

Using your email address

You can send documents from your own email address as PDF files. You may not get opening notifications, depending on your client's mailbox.

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

iOS: Billdu uses your native iOS mail app to send emails

Android: Billdu checks, if you use Gmail app. Otherwise it opens a dialog with multiple emailing choices

Note: When you use your own email app, invoices and other documents are sent as PDF files by your email app. You won't get replies to your Inbox.

Changing the email address


You can change or add another email address to your iOS device. You can even switch between more email accounts while sending invoices – click here to learn more. You can select from which address your emails are sent. Set a primary email address in your mobile device settings under Settings – Mail – Default account. 


If you've set a default mail app for Billdu and would like to change it, take a look here


  • Emails come from your email address

  • Sending only PDF files

  • Emails are stored in your email app in the Sent folder

Undelivered emails and spam

Take a look here if your email messages land in spam or aren't delivered.

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