Re: Sieve deleteheader and :count match type

Ned Freed writes:
>> It's far-fetched, but deleting both subject fields if there are two or 
>> more? I think most people choose to use the first. Choosing to delete both 
>> isn't entirely unreasonable, though.
>
> I don't really see a case for deleting all of them.

FWIW, the messages I saw with two subject fields (back when I cared about 
such things) had two misleading/garbage/bad subject fields, not one with a 
bad value and one with an appropriate value.

My choice was to keep the shortest syntactically valid subject. But based 
on the data I saw I considered deleting both to be a defensible option.

>> The same applies to other header fields that may occur at most once.
>
> Again, all but one, sure, or maybe appending them to each other. But not 
> full deletion.

I see I also analysed messages with two content-type, 
content-transfer-encoding, message-id and date fields, but don't seem to 
have seen any where deleting both was appropriate.

Arnt

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