Change email sender name without changing forum title

[spamgirl]

I've been working on my SEO and now have keywords in my title. That said, my email sender name is long and obnoxious. I was wondering how I would go about changing the email sender NAME without changing the title of my forum? I'm sure I have to change it in some PHP file somewhere, I'm just wondering if anyone knows which one I should change?

Thanks in advance!
Spamgirl