Questions to consider...
How do you plan on parsing data that could come in any format?
How will you know what data is for what?
How will you know the order of the data?
How can you trust people to send data in a specified format that will even make it parseable.
Parsing the from address and subject and body text etc (as those links above are about) is not the same as parsing information in an email.
What type of data are you trying to parse?
Are you taking everything in the body of the email and storing it or are you trying to parse information that they put in the email?