Tellier Benoit closed MAILET-159.

> RemoveHeaderByPrefix mailet + HasHeaderWithPrefix matcher
> ---------------------------------------------------------
>                 Key: MAILET-159
>                 URL: https://issues.apache.org/jira/browse/MAILET-159
>             Project: James Mailet
>          Issue Type: Bug
>          Components: Base Mailets
>    Affects Versions: master
>            Reporter: Tellier Benoit
>             Fix For: master
> We, at Linagora, use Headers to pass information from James to other 
> subsystems. Such example can be found as the ICALToHeader mailet.
> However, this introduces a vulnerability: someone can send a mail with these 
> headers, and pretend some processing happened in our James instance. To avoid 
> this, we strip such header. 
> But every time we add a new header, we need to add a new RemoveMimeHeader 
> Mailet parameter from stripping. This is error prone.
> We would like the removal to be doable by prefix: this way, if all of our 
> specific share a common prefix, we don't need to review configuration every 
> time we add a feature. 
> Thus:
>  - RemoveHeaderByPrefix allow removal of you prefixed header
>  - HasHeaderWithPrefix allow you to report emails using your internals 
> prefix, to potentially take further actions

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