kmail: The server certificate failed the authenticity test

I receive the following message when I send an email with one of my email addresses: The server certificate failed the authenticity test The certificate is good to 2016, but something else must trigger this dialog. I don't know how the code logic inspects certificates to send those dialogs. Perhaps I have something configured incorrectly. A second dialog prompts: Would you like to accept this certificate forever without being prompted? I select Forever but the next time I send an email I see the same dialogs, which implies kmail is not saving that option correctly. Can anybody confirm this behavior? I don't see anything obvious in the bug tracker. Darrell