miken...From Karoo question and answer pages
I already use my Anti-Virus software to protect my computer and don’t want your email Anti-Virus service. Can I opt out? You cannot opt out of the service. Anti-Virus software has the limitation of you not having the most up-to date virus signature on your computer and therefore not stopping the virus from infecting your computer. Kingston is protecting its network and the services we deliver to all our customers and therefore this service is provided free of charge.
The full page is at
http://www.karoo.co.uk/helpandsupport/myemail/faq_antivirus.aspI changed from karoo1000 to pro 2 weeks ago then this happens, no probs before,I will ring Karoo anyway to see if it has anything to do with them, if not yahoo is next port of call.