
Fix https://github.com/OCA/social/issues/701, following idea from https://kb.mailwizz.com/articles/low-score-in-spamassassin-because-of-the-rand_mktg_header-rule/ to avoid matching the regexp explained in https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7888#c5 @Tecnativa TT29674