To whom it may concern,
I know {Name} via {connection/relationship} and understand that they seek to become a new {power/cable/internet/etc.} customer of yours yet require someone to vouch for them.
Accordingly, I, as a current account holder, am happy to serve as a co-signer, ensuring that you can't go wrong by starting service at their residence.
I have enclosed and signed the requested documentation.
Sincerely,
{Sender}
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