Comment (by Gabriele Bozzola):

I can reproduce this problem with GMail, but maybe I should clarify that I get these emails with the option digest (looking at pipermail I assumed that this detail was not important). This is what I see as subject of the email:

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If I click on the link, I end up in a HTML page that is not rendered.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2523/the-trac-mailing-list-could-have-more