Github user sebbASF commented on the issue: https://github.com/apache/incubator-ponymail/issues/411 Note that the mod_mbox URL for the same mail does escape the '@' char: http://mail-archives.apache.org/mod_mbox/www-announce/201703.mbox/%3CCAMopvkMnEs7RD4sn3FmphFNoNp5rmEve%3D7o93JxDVAN3eqp0UA%40mail.gmail.com%3E
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