unsolicited email continues from direct mailers like minutemail for example using spoofed sender address disguised to look legitimate with known sender companies.
the frequency and repetition indicates that this may be done by bots as I can watch them come in every few minutes sometimes with identical emails following each other perhaps I am on multiple mailing lists.
The sender changes address and almost daily will have several new sender address sources.
many appear to come via icloud or amazonaws.
flters and balcklists need continual updating to keep pace, the bots can bypass any filtering by automated software known as hash busting.
I get a mixture of fixed address's which can be blacklisted and also address's which change a number in address each time but the fixed part can be used to filter.
the battle to stop spam is impossible to win, it is like a flooded river and difficult to ever stop.
"so it is best to accept it can not be stopped at all" using conventional filters etc and virgin servers obviously are allowing the spam through.
The use of a bayensian filter can reduce spam and needs software, some email clients use it. and spam filters are available commercially, but ones that just use whitelist/blacklist still require a lot of manual input. I have tried free ones but unless the paid version is used they do not work very well or only for a trial period. (Bayesian filtering is a method of spam filtering which has a learning ability using algorithms)
Perhaps it is time virginmedia looked at the spam issue looking at the hundreds of posts on the subject?, they are excellent for tv/phone/broadband but the email has issues. My email is an old ntlworld.com which is on lots of spam mailing lists. With modern technology there should be a solution. While typing this post about 5 spams have arrived mostly repeating ones, about one every minute caught by the blacklist.