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Re: Testing Marking Cross-posts as read in SeaMonkey

On 13/06/2018 07:14, Daniel wrote:

> The way I figure, there must be information in the message headers which 
> is common to all the cross-posts but different to any other posts in any 
> of the mentioned groups.

Yes: the Message-ID.

That of your initial message is <k-mdnZrvbIm2Nb3GnZ2dnUU7-dXNnZ2d@xxxxxxxxxxx>

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