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

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

--- Comment #2 from [email protected] ---
(In reply to Jeremy Harris from comment #1)
> 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>
> 
>         ...

Hi! I've thought about this approach, and there is still a minor downside: if I
send a mail to [email protected], it still wouldn't work. Adding this
flag would also make it simpler. I'm willing to submit a pull on this.

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