Email based classifieds system

Instead of a website, I want a classifieds system that uses keywords in the received email SUBJECT to:
receive adverts and place them in the right table
receive search parameters and query relevant database table and return results via email to sender

Also, when an advert is received the system automatically sends the advert via email to people looking for the items in the advert parameters
When a search request is received the system automatically sends the inquiry via email to people who advertised items in the search parameters

The advert/search parameters are found in either:
after the keyword in the email SUBJECT, or
in the email BODY

In the following 3 examples, the keywords are in uppercase, and the parameters in lowercase:

ADVERT 1975 Mustang super condition. Offers $
FIND Corolla 1.5 or 1.3 liter, 2005 or newer

ADJOB accountant degree 5 years experience FMCG
FJOB water engineer 3 years experience in municipality

ADHOUSING 3 bedroom apartment Central Rivonia, second floor
FHOUSING 1 room bachelor flat Soweto

Important: Stemming so that a search for, say, "accounting" returns "accountant" as well