For Mac users, Postbox can be integrated deeply within the Mac OS X environment. It will incorporate the Mac Address Book upon launch, and when set as the default mail client, it will be utilized by iCal and iPhoto when sending events and photos. Clink the topics below to read more: 

• Setting Postbox as the Default Mail Client on Mac
• Mac Address Book Integration
• iPhoto Integration
• Quickly Attach Files on Mac
• Attach iPhoto pictures using the Mac Media Browser