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Absolutely, there'd be hell to pay if my client's clients knew I was a contractor. I'm supposed to be representing my client, and my email sig (and business card, no less) reflect that
At the moment I use my own e-mail address and not the clients. It had its advantages of being able to use it as a weak IR35 argument as I don't look permie. But there are disadvantages. I usually have to copy in my client contact on all e-mails that I send in order to get people to realise that I am authorised to work for ClientCo.
Had a few suppliers refuse to speak to me as I couldn't vouch for who I am.
Also ClientCo use me to e-mail out anything relating to new un announced projects so if it goes tits up and the press get eind of it (usually job losses) then they can deny all knowledge.
Current client Co has a decent policy I think. All names in the client Co email address book have [Contractor] suffixed after your name and the email sig says "Contracted to- Client Co Ltd." As this is formally implemented by client Co for all contractors, I think it is pretty useful to have IR35-wise.