Letter writing etiquette

[t1grm]

Quick question. What’s the suffix/prefix you put on a letter if you want someone to sign a letter on your behalf? Is it pp or pc or something? E.g:

Yours sincerely


Joe Bloggs
pp John Smith

Where the letter is from John Smith but is actually signed by Joe Bloggs on behalf of him?

[staceyb]

PP

[vodkakid]

its pp mate

[t1grm]

Cheers folks! Knew someone on PH would know this.