[Bug 3171] wishlist: Add flag to mark recipient as unique to allow duplicate delivery

https://bugs.exim.org/show_bug.cgi?id=3171

--- Comment #1 from Jeremy Harris <[email protected]> ---
I think this can be done with existing facilities:


local_sender:
        # copy the message to senders "Sent" folder
        driver =                redirect
        # this restricts to a "local" source
        condition =             ${if def:authenticated_id}

        # this spots a suffix attempt
        local_part_suffix =     -sent
        local_part_suffix_optional

        data =                  ${if def:local_part_suffix \
                {:fail: Denied delivery to Sent folder} \
                {${quote_local_part:$local_part}@$domain, \
                  ${quote_local_part:$sender_address_local_part}-sent@$domain}
\
                                 }

        # this avoids reprocessing either target
        redirect_router =       local_users

local_users:
        # this is specific to unix-login users
        # replace with the existing local-user routing
        check_local_users =     yes

        # handle both non- & suffixed variants
        # use def:local_part_suffix to direct to the Sent folder
        # $local_part will have the suffix stripped
        local_part_suffix =     -sent
        local_part_suffix_optional

        debug_print = T: \$local_part_suffix <$local_part_suffix>

        ...

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