STEPHANIE DUNCAN - Public relations officer, West London
I never tick opt-in boxes online as I worry about the level of junk emails I will receive. Once you give permission, emails could come from a partner company or the parent one - there's no end to it. Even if you don't tick the box you get many emails asking if you'd like to try this or that product.
I don't mind getting a lot of emails from my bank - for me it's the one exception. If I bought from a company regularly, then maybe I'd be more inclined to opt-in, but if I buy something as a one-off I don't really want them bothering me all the time.
OLLIE LIVIERI - Shop assistant, North London
I don't opt-in online to get more messages - the less rubbish I get in my inbox, the better. It only takes one email address for companies to send emails to you and when they start sending you all the junk email, it fills up your inbox.
I try to avoid opting in, unless I'm really interested in the product as companies have tried to email me in the past. For example, I'm very into my music and clubbing, so if I'm buying tickets for a night out and there's an opportunity to receive updates on other nights, then I would opt-in.
LEON AYLMER - IT manager, Portsmouth
I avoid opting-in on websites to stop getting lots of emails and because I think about the environment. I do give permission for some companies to email me, though, like my energy service provider EDF, because it sends me a paperless bill and special offers. I don't mind existing household providers getting in touch either as it only takes a click to delete.
I have done a lot of shopping online with companies such as Ocado and Amazon but I never agree to their opt-ins. I know where to get something I want, and if I don't, I'll research it myself.