That is the only function that I use, and no, I don't confirm emails. I checked in various scenarios sending with verified and not verified accounts, created on private proxies and public proxies, 1 ip per acc or 6 per account, and results are always the same - if people spam, they get suspended. If you verify it with email, you can return your account when they suspend it, just send them email and after 5 or 10 days you have it again. But for this purpose no need to verify acc because it will not last long.