Bug 327384

When editing an e-mail address the e-mail addresses are case folded to lower, i.e. John.Doe@example.com is transformed to john.doe@example.com.

RFC 2821 (http://www.ietf.org/rfc/rfc2821.txt) says about this:
"The local-part of a mailbox MUST BE treated as case sensitive."

This causes problems for example, when KMail is looking up from-addresses from emails in the addressbook in order to display the picture of the sender. If the from-address contains capitals the lookup fails.




Reproducible: Always

Steps to Reproduce:
1. Start KAddressBook
2. Edit or create a contact
3. Add or change an e-mail address so that it contains capital letters
4. Click "O"K
Actual Results:  
The e-mail address is transformed to lower case.

Expected Results:  
Either: The e-mail address should *not* be transformed to lower case but remain as typed in. 
Or: The local-part of the e-mail address remains as typed in, the domain can be case folded to lower.