Quote Originally Posted by Casiopea
sends => send[z]

That pronunciation is English. It's the English "accent". Note, the pronunciation send[s] is not English, and, moreover, if pronounced that way it's a tell-tale sign that the speaker is not a native English speaker. That is, non-native speakers say send[s]it.
At the end of a word, a voiced sound (e.g. b, d, z, g) become voicless (e.g. p, t, s, g) if it comes after a voiceless sound, like this,
borrowing words from another thread (the one about conditionals and willx2) you're saying that if somebody pronouces it send[s]it, this person is not a native speaker (which is a very valid conclusion). But then you say that non native speakers say send[s]it. That is, form the valid sentence "if P, then Q" you conclude "Q therefore P". Which, of course, it's not a valid conclusion.

Apart from that I LOVED the explanation