Job Title/Position under Signature on 'Cold' Sales Letter? Yes or no?

I stumbled on this forum after searching this question so here it goes for my first thread. Here's a little background regarding my question. At a recent tradeshow, my company got some leads and I'm working on the follow-up letters to send via email/regular mail. I don't know if it would matter but the company I work for is a manufacturer of scaffolding equipment.

I was working on a letter that, unlike most that I've sent in past years, I'm doing a little more thinking about all the minor details and this question came up. Should I put my sales position under my signature at the bottom? For example, it would read: Sincerely, (my actual signature), and then underneath, my full name, and (depending on whether I should or not) Sales & Marketing Associate.

Initially I was thinking of leaving it to make it more personable even though it is clearly a business letter. But I wasn't sure if that was the best idea. What the consensus out there? Yes or no? Thanks for your input and opinions in advance. I'm looking forward to using this forum a lot in the future.