Q: When I print from my ipad4 my inbox prints too I have hp 7510photosmart

Frank adds in another thread:'

I Forgot to tell you what printer I have it is HP 7510 iOS 8.1.2  thank you

I do not see the 7510 on the list of supported printer.  double check.

About AirPrint - Apple Support

printing to a non-airprinter from an iPad

To print from the iPad, your going to have to install some more software:

-- install a printer app on the ipad. many printer makers have iPad applications for their printers.  Look in the app store

-- install enabling software on a computer which you have connected the printer

Helper app -- /print n share

Print directly to the widest range of network or WiFi printers available in any app. Alternatively print via your computer to ALL printers including USB & Bluetooth printers. View read and display large PDF, Office & iWork files. Easily transfer & store files from the Cloud or your computer.

https://itunes.apple.com/us/app/print-n-share/id301656026?mt=8

HP  ePrint Home & Biz

     http://itunes.apple.com/us/app/hp-eprint-home-biz/id299531647?mt=8

  http://h10025.www1.hp.com/ewfrf/wc/searchResults?tmp_product=HP+Photosmart+5515+ e-All-in-One+Printer+-+B111a&product=5063608&tmp_qt=eprint&cc=us&dlc=en&lc=en&su bmit

Should you have some office printer that are connected to a computer there are print enablling applicaionts you can run on the iPad to print to such printers.

For Windows, try:

   O'Print

      http://oprintware.com/

   PrintCentral

     PrintCentral is the supreme printing app for the iPad, iPhone or iPod Touch

     A real DEBE -- does everything but eat.

     http://mobile.eurosmartz.com/products/printcentral.html

Mac and Windows

"WePrint enables printing to shared printers for iOS/Android devices from our range of printing Apps."

http://mobile.eurosmartz.com/downloads.html