[TrevorStepnikkk]

In my 1,5 years of usage I haven't encountered any incidents of missing mails. As I understand it they rely on greylisting which makes it infeasible for spammers.

There have been e-mails that took around 5 minutes to show up in my inbox, but this was mostly with "low-traffic-domains" and only for the first e-mail. Subsequent e-mails have been delivered instantly.

And: it's a really nice not to have to check one's spam folder every day for falsely marked legitimate mails. I am very happy with the automatic system.