[kmail2] [Bug 483987] New: "Reply all" protection: ask for confirmation before replying to a potentially large number of recipients

[Thomas Fischer]

https://bugs.kde.org/show_bug.cgi?id=483987

            Bug ID: 483987
           Summary: "Reply all" protection: ask for confirmation before
                    replying to a potentially large number of recipients
    Classification: Applications
           Product: kmail2
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: composer
          Assignee: kdepim-bugs at kde.org
          Reporter: fischer at unix-ag.uni-kl.de
  Target Milestone: ---

Similar to the existing "Check Before Send Mail" plugin, Kmail should warn and
ask for an extra confirmation if an email is about to be sent to a potentially
large number of recipients.
Criteria to test for:
- Number of recipients in To, CC, and BCC fields is about a certain threshold
- A mail address previously configured by the user as a "distribution address"
is used.

A "distribution address" would be a mail address like "everyone at example.com",
where the mail server then takes are to distribute the mail to a large number
of recipients.

Those check should not be limited to cases when the user chooses "reply all".
Even a 'normal' reply to a distribution address should trigger a warning.

Implementation detail/suggestion: Before sending, KMail or Akonadi counts the
number of mail addresses (To, CC, BBC). Every mail address which is in the list
of known distribution addresses counts 1000 (or any sufficiently large number).
The threshold for a warning is 10.

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