Version:           1.13.3 (using KDE 4.4.3) 
OS:                Linux

For IMAP accounts with anonymous login and empty password, Kmail does not remember the empty password. Tried checking/unchecking "Store IMAP password", tried "Security: Authentication Method: Anonymous/Clear Text". Had this problem on all KMail from KDE 4.x.y versions up to 4.4.3 compiled either by Mandriva official or Mandriva third-parties

Reproducible: Always

Steps to Reproduce:
1. Create account for http://dovecot.org/mailinglists.html called, for example, dovecot-archives (dovecot.org as the host-name, anonymous as the user-name and an empty password)
2. Check (or leave unchecked) "Store IMAP password"
3. Set "Security: Authentication Method" to either "Anonymous" or "Clear Text"
4. Save account
5. Exit KMail (or Kontact)
6. Launch KMail (or Kontact)
7. Click on Check Mail in All folders icon

Actual Results:  
User gets prompted for password on dovecot-archives (annonymous-with-no-password) account. If you check the "remember this password", exit Kmail and try again, you get prompted again for password.

Expected Results:  
If password is empty and save password is checked on account configuration, 
OR using Anonymous "Security: Authentication Method"
OR user checks "Remember password" on a password dialog and there is an empty password

THEN KMail should remember that for this account, password is empty and not ask for password again

Entering a random password on account set up, checking "Remember IMAP password" and selecting Anonymous "Security: Authentication Method", then KMail does not ask for password.

This works, but it is ugly and non-intuitive (and wrong)