So I set this up and after installing Hola - this is what I found:
This was just one of several connections taking place on port 25.
After completely removing Hola and checking again the traffic vanished.
While Hola's paid services apparently remove you from the peer to peer portion of the network, as far as I'm concerned Hola has no right in calling their free service a VPN and effectively turns it's users into unwitting spammers.
If you do use Hola - remove it.
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Whilst Hola's VPN service is of concern what is equally worrying here IMHO is had it not been for Virgin Media's unorthodox use of Spamhaus's CSS the spambot activities would have remained unnoticed; maybe time to harden the outgoing firewall rules where supported.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.