This was happening for me with smtp.virginmedia.com - however, it now seems to be back to life and working again (for me anyway)
_________________________________________________________ Graham I am a VM customer. There are no guarantees that my advice will work. To say thanks click the kudos thumb. If I have solved your problem please click the helpful answer button.
Thanks for replies. It seemed to resolve itself after an hour or two which seems common to others experience. I would have accepted it if the engineers had announced a problem but when they say all is well, one panics