There are regular requests about Okular having a "Send by Mail" menu item in the File menu.
In terms of implementation, it is a five minutes hack, since all you have to do is create a new KAction that calls KToolInvocation::invokeMailer with a few params and you are done.
Yet, i have been refusing to implement it since i do not think it is Okular responsibility to offer this feature.
I can understand that users are used to Adobe Reader having it, and in the unintegrated world of Windows it makes sense that every app includes as many features as possible since it is you versus the world.
On the other hand, in KDE land we pride ourselves of having things properly integrated and each feature in the software where it logically belongs, and in my book, the action of initiating the sending of an email, does not belong to a document viewer.
It is true though, that even if I've been involved in UI designing/programming for a while I can't still say I know what belongs to a given program or not.
Because once we add it to Okular? Why not to gwenview? And why not to Calligra? And And And?
What do you think?