Re: Filtering out duplicate messages

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Julian Gilbey writes:

> Hello!
>
> I've just switched to maildrop from mailagent
> (https://github.com/rmanfredi/mailagent) as mailagent has stopped
> working with the latest Perl in Debian (5.40).
>
> One feature that mailagent offered was a UNIQUE filter: if a message
> is addressed to both me and a mailing list I am subscribed to, I get
> two copies of the message.  The UNIQUE filter was able to process a
> duplicate copy of a message in a different way from the first copy to
> arrive.
>
> Is there anything similar available in maildrop, or has someone
> written some code to achieve this effect?

This is usually a filter that checks for unique Message-ID: headers.

This can be done by calling out to reformail, and using its -D option.

`reformail -D 10000 $HOME/seen-msgids`

if ($RETURNCODE !=3D 0)
{
    =E2=80=A6
}


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