sieve not updating headers?

[Vincent Brillault]

Hi!

> It then falls through my personal sieve filter and hits the implicit
> keep at the end and ends up in my inbox - with the original headers.

I had a similar issue recently (with addheader, not deleteheader) and I
was pointed to the RFC:
https://datatracker.ietf.org/doc/html/rfc5293#section-5

```
The deleteheader action does not affect Sieve's implicit keep.
```

My addheader case was solved by adding an explicit keep or a fileinto.

I hope that will also help you,
Vincent

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