A/I :: why a mailbox on A/I?

Yes:

because i think the struggle to defend free speech and communication cannot be delegated to anybody.
because i want to make a small difference in my daily life, to keep away from multinational corporations. and because for some reasons, (the wrong ones, mind you!) you trust us :)
because i prefer my mailbox to be a private matter (and you want to use SSL)
because i don't want to help advertising a big company when i give someone my mail address.
because i am annoyed by those who give me an email account for free and then send me tons of banners and promotional offers.
because when someone tries to shut down a/i services or threaten their security, the a/i collective will try to make their best to avoid it. And the more we are, the more it will be interesting.
because i like your domains (well, if it's only for this reasons, we won't be exactly "glad" to give you an account... try to understand exactly who you are dealing with...)
because i don't want my business in the internet to be monitored, processed and resold to the best offering company
because the more we are, the louder we can scream.
because you answer my email, sooner or later... well at least you try to!

NO:

because it's not a free service (like free beer) but a service working only if everyone contributes what he/she can every year.
because when they attack freedom of speech and of communication i will be the first to know... or almost the first one...
because our servers are not secure 100% and privacy safeguard is only up to you in the end.
because i have other trusted internet resources i can use.
because i have nothing to hide.
because it seems gmail works better.