Version:           1.9.6  (using KDE KDE 3.5.8)
Installed from:    Fedora RPMs
OS:                Linux

When composing an e-mail and then in the To-field with the first letter of the name, there opens a recent address list. When scrolling down the list to the desired mailaddress, the To-field contains multiple mailaddresses. That's strange, because I haven't selected any emailaddress yet.

My recent list:
"Graaf, B.O. (Bram)" <bram.graaf@mail.nl>
"Karels, J. (José)" <jose.karels@mail.nl>
W Wortel <wwort@mail.nl>
Z Abrabham <zabrab@hot.nl>

I think the problem is in the , of the name. Scrolling between the first two gives the following in the To-field:
"Graaf, "Karels, "Graaf, "Karels, "Graaf, B.O. (Bram)" <bram.graaf@mail.nl>