If you mail an attachment from one mail client then it does not matter if the receiver uses a different mail client. The mail you send should be able to be read from their mail client.

The British ruling class are fighting against Hitler, whom they have always regarded and whom some of them still regard as their protector against Bolshevism. That does not mean that they will deliberately sell out; but it does mean that at every decisive moment they are likely to falter, pull their punches, do the wrong thing. Until the Churchill Government called some sort of halt to the process, they have done the wrong thing with an unerring instinct ever since 1931.

a secrete breach, a secrete bed (Spenser)

..in those works by Schelling, the didactic tone passes into one of rebuke: readers are frequently taken to task in advance for their inability to understand. Incomprehensible to the reader of his own philosophemes which arise from want of cleverness in his own thinking.