I want to copy an email data into a SharePoint list. User will select which e-mail s/he wants to add and e-mail will be coppied into a multi-line text box. Also, e-mail attachments will be copied automatically. How can I do this?
This seems like a pretty complicated task (it looks easy if you already have the prerequisites configured). Essentially you have to enable and configure the SMTP Service in CA, enable sites to receive emails, activate the feature on the site collection/site level and then enable the individual list settings. There are a few more things you can do with it and this video (http://technet.microsoft.com/en-us/sharepoint/Video/ff679958) has a lot of good information about setting it all up.
Let me know if that works out for you!