If you've sent an email from your iPad or iPhone and it hasn't been delivered, you may want to check the settings of your native mail app. The iOS Billdu app uses your native iOS Mail App to send emails. Also, check the Sent items in your iOS Mail app – if the invoice is there, it has been sent.

An email may land in the client's SPAM folder, or it has been filtered due to high-security settings of the client's mail app – this is something you or us can't influence.

There are more ways to send emails, you may want to take a look here or here to learn more about it.

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