I have been spending a fairl amount of time recently pulling email I want to read from the spam folder, even emails sent to me from my own contact form.
Today while pulling an email from the spam folder I was greeted with this message.
This appears to be something newly implemented as Forrester Research were recently talking about problems with filtering.
There are also seems to be lots of talk about an offline version of Gmail coming soon, but so far nothing substantial in the rumour mill.
