Email in mobile apps

How emailing works and how to set up/change the outgoing email address on your iPhone, iPad or Android

Updated over a week ago

By default Billdu app sends documents from our mailing server - they come from our email address We also display your business name.

We send replies of your customers to your email address.

Example of an e-mail in Gmail

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

Using your own email address

You can send documents from your own email address as PDF files.

By doing this you may not get push notifications about opening an invoice.

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


Billdu uses your native iOS mail app to send emails


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

When you use your own email app, invoices and other documents are sent as PDF files by your email app. You can see all outgoing emails in your Sent folder of your iOS mail app.

How to change the outgoing 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. 


Billdu uses Gmail as the mail app of choice if there are multiple installed on your device.

If you'd like to keep the Gmail app on your phone and still send invoices from another email address, it's necessary to add your email address to Gmail. Take a look here for more information.

Undelivered emails and spam

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

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