Yorkshire Pudding wrote:Thanks Tomo. I use AVG free, new version 7, all fully functional, updated daily with a full scan every day.
So is it likely to be originating from my computer then?
130 more between 11.00pm and 07.00am!

Sounds more like your website has been found and an email address has been discovered on there.
The spambots literally then send out loads of 'stab in the dark' emails in the hope that some get through.
If it's any consolation, we host about 70 domains, consisting of about 100 actual domain names. 5 of these are our own (not clients) and currently on our 'spam-o-meter', we are up to about 1800 spam messages a day.
Anti-virus won't help at all I'm afraid. Go to 'versiontracker.com' and search for a spam filter... there's loads of free ones which use matching methods, 'Bayesian' filters and more self-teaching methods to get the cr@p out and leave your inbox clean again.
If you actually own your own server (as we do) you could consider a server-side solution, such as SpamAssasin, which kills the spam at source.
And because prevention is better than cure, DO NOT put your email address on yours or anyone elses website. If you must have it on your own site, there are ways of cloaking it so that spambots can't use it, but humans can... PM me for more info.
Finally, NEVER give email addresses out willy-nilly. Sometimes they are a necessary giveaway for things such as signing up to forums etc. In which case, get a disposable one, such as a Gmail or take a look here:
http://email.about.com/cs/dispaddrrevs/ ... osable.htm
Basically, you create a throwaway address for signups etc, and if it's level of spam gets high, you just cancel it and get another!
Our spam at work is now down to just 2 or 3 which slip the net each day.
The problem is, SPAM is evolving as quickly as spam filters. It's all humanly engineered—so even the toughest spam filter can be reverse engineered and loopholes found, so you'll never stay on top.
As I said, the best method is to prevent the spam rather than cure it.