Maybe something like this:
Dear Mr Smith,
my name is Neo, and as I got your email address from Mr Morpheus
without having met you in person before, please allow me to introduce
My profession is that of a programmer. I have expert knowledge in
search engines and one of my latest project involved developing my own
search engine for automatic web page scraping and later text
classifaction and rating using a semi-autonomous text analysis agent.
I have learned from Mr Morpheus that you are currently involved in a
project dealing with similar issues. Therefore, I would like to offer
my expertise to you.
If you are interested, do not hesitate to call me at +1 2317 424242.