[Dovecot] Detecting duplicate messages with sieve

[Timo Sirainen]

On Fri, 2011-09-16 at 00:02 +0200, Aleksandar Lazic wrote:

> "Detecting duplicate messages"
..
> Is there a similar feature in sieve 

No.

> or can I still use the upper setup?

I think so.

> Another question is about to add this header line in every mail.
> 
> xfilter "${REFORMAIL} -a\"Lines: $LINES\""

What do you need it for? But nope, I don't think there's a way to do
that with Sieve either. There's an extension to add headers, but it's
not implemented yet. And I don't think there's a way to get the number
of header lines.