Definitely not since we've learned that (some) webpages send each keystroke while on the login page.
> Unfortunately, the code in your browser that powers Facebook still knows what you typed—even if you decide not to publish it.* It turns out that the things you explicitly choose not to share aren't entirely private.
http://www.slate.com/articles/technology/future_tense/2013/1...
EDIT:
From https://en.wikipedia.org/wiki/Petraeus_scandal
Petraeus and Broadwell used fake names to create free webmail accounts
exchanging messages without encryption tools.
They would share an email account, with one saving a message in the
drafts folder and the other deleting it after reading it.