i'm not sure the onus is any different at all: either way there would have to be proof of the formation of the contract - in one case proof of the existence of a clear sign, the other proof that the terms and conditions were displayed.
To clarify - in this instance I believe it is different. Here we are talking about a client agreeing to a designers terms and to ensure receipt of payment... not the client leaving his property in the hands of the designer.
Emailing someone to ask them whether they agree to the terms and email back to confirm same seems an extremely false and somewhat awkward way of ensuring there's proof they've agreed to the terms of the contract, especially where a statement on any quotation would suffice. I'm not sure how i'd react to such an email - it seems somewhat confrontation in manner.
Again, to clarify... upon having already discussed project and met if appropriate, I email a contract specific to the job along with a project schedule and T&Cs. In order to proceed, I request the client confirms all is written as discussed and if you are happy with that and all the terms, please confirm by making the aforementioned statement. I do not find that awkward or confrontational and have never had anyone complain.
The law does make provision for an electronic signature, however, i don't believe mere email is sufficient - regardless of the account the email is sent from.
I said it helps if it's a personal account rather than generic, i.e. it is harder for a client to say they were not aware of the terms if it's been sent to them directly.
Arguably you are confusing the issue in another way too: you state that the T&Cs are "stapled to a copy of the contract" but the T&Cs are part of that contract. Furthermore, you seem to imply that the terms of the contract (i presume details such a price, timescales) have been agreed and then you send the T&Cs email - someone could argue that the contract had already been concluded and then you advised them of extra terms.
No, I don't think I am confusing anything... as explained above, the T&Cs is not separate from the terms email at all, and the confirmation reply is attached, referencing the document, as a way of me knowing as much as anything that they have confirmed their acceptance of the contract/schedule/terms/etc.
I'm not criticising the way you do it; you'll certainly have ample proof that you're clients have agreed to the terms but i wonder whether it's overkill.
No, I don't believe it is - admittedly I perhaps had not explained the full process I use clearly enough but in fact, all I am asking for is a reply email to the one I send out my terms/contract/etc in - I know they have received it and claim to have read it, I know they have agreed for me to do what's listed whether they have read it or not, and they know they have 'signed' to agree to it, whether they have read it or not and neither party can dispute it later - isn't that the point of the contract after all?