[RawInfoSec]

I should also note that no email provider should be trusted for 'important email' as mentioned in the article title.

Two reasons.

1) Email is not built with security in mind. Don't suggest SSL as it only protects (somewhat) while in transit and not at rest. You can also bet that not every recipient you send to is using an SSL-enabled POP3/IMAP connection to check mail, so you can't control that end of the conversation.

2) It has no delivery assurance and wasn't built with that in mind. You can never be sure if it arrived, or will be read (by an actual person).

That said, if you need to transmit important documents, use FAX (if the destination has their own (not shared) FAX. Or simply drop it off.

If you need delivery assurance, pick up the phone and ask if they got it, or send if via courier with signature request on delivery.