Re: Auto-respond only if file exists

On Tue, Aug 05, 2025 at 05:53:51PM +0200, Peter Thomassen via Exim-users wrote:

> A user has the following Exim filter:
> 
> # Exim filter
> if personal alias [email protected]
> then
>   unseen mail
>     subject "Automatic reply: $h_subject:"
>     from "[email protected]"
>     extra_headers "Content-Type: text/plain; charset=UTF-8"
>     file ./.reply.msg
>     once ./.reply
>     once_repeat 7d
> endif

This filter is not a good idea.  It appears to fail to take into account
the essential requirements of RFC3834:

    <https://datatracker.ietf.org/doc/html/rfc3834>

in particular the exceptions listed in:

    <https://datatracker.ietf.org/doc/html/rfc3834#section-2>

and ensuring that auto-reply envelope sender is the NULL sender: <>.

So unless those requirements are built-in features of the filter syntax,
this filter MUST NOT be used without appropriate modifications.

-- 
    Viktor.  🇺🇦 Слава Україні!

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