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http://bugs.kde.org/show_bug.cgi?id=109926         
           Summary: Kmail does not expand empty distribution lists or show a
                    warning
           Product: kmail
           Version: 1.8.2
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: composer
        AssignedTo: kmail-devel kde org
        ReportedBy: oded geek co il


Version:           1.8.2 (using KDE 3.4.2, Mandrake Linux Cooker i586 - Cooker)
Compiler:          gcc version 3.4.3 (Mandrakelinux 10.2 3.4.3-7mdk)
OS:                Linux (i686) release 2.6.12-8mdk

When a distribution list contains 0 items (happened to me after I lost all me contacts, but that's another bug report), when selecting it as an destination address (even when it the only destination address), not warning message is shown to the user (and the list is also visible in the "selected addresses" dialog, although its clearly marked there as having 0 email addresses).

Also, and worse, in said case the distribution list name is not expanded to its values (being none) and instead the email is sent with the name of the distribution list as the destination address, which will cause the SMTP mail server to try to send the email to the address <distribution list name> <server's default mail domain> which is something less then useful (as probably the first indication the user gets that something went wrong, is the email server's cryptic bounce message - if that is even configured).

I would expect that kmail would expand the distribution list to its values before contacting the SMTP server, possibly before even closing the compose dialog, and will warn the user that there are no recipients (as it does now when no recipients are present in a message being composed). IIRC that was the behavior for Kmail 1.6 and it was changed somewhere along the way, I believe in order to allow users to edit emails in the outbox and still treat distribution list recipients correctly in the edit email.
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