Journal Spam dans les spams

Comme la plupart d'entre nous, je reçois régulièrement des mails pour me vendre du Viagra et pour augmenter la taille de mon pénis (alors que bon...).
Depuis quelque temps j'ai remarqué que dans certains d'entre eux, entre les lignes se trouvent d'autres lignes, presque invisibles, du genre:

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Ma question: quel est le rôle de ces lignes? Passez outre les filtres anti spam?