Hi.
Is it all RISI emails (i.e. swapping ones), or just forum emails?
We did change the email server that sends out the forum emails, so it is possible that it's getting blocked now, but it wasn't before.
Also, the address you need to add to your contacts for the forums is different from the main RISI admin address: it's noreply@forums.readitswapit.co.uk (the standard admin address is admin@readitswapit.co.uk). So, just follow the instructions at http://www.readitswapit.co.uk/SafeSender.aspx but substitute "admin@readitswapit.co.uk" for "noreply@forums.readitswapit.co.uk". I'll update that page to add the other address.
Neil.