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The gemarah in Yevamos (78b) says "mamzer eino chai" (A mamzer [who is not known, look later in the daf] doesn't live [for more than 12 months] so not to proliferate mamzeirim).

On the other hand:

  1. However, the Gemarah in Kiddushin (72b) say that if not for the din "keivan shenitmaa nitmaa" (a unknown mamzer is considered kosher) when Eliyahu would come, he would take out bunches and bunches of mamzeirim who were lost within the Jewish people.

    How could there be so many of them if they should have died as soon as we lost track of them?

  2. According to opinions (end of 1st chapter of Yevamos) who say that a result of a Jewess and a slave/non-Jew is a Mamzer forbids Tarmod, since there are many mamzerim there.

    If unknown Mamzerim don't live, they should have died out already and one can marry whomever they want (assuming basic due diligence). Why is the whole town forbidden?

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Can this not be the subject of a machlockes (yes I know the discussion about machlockes in metzius). – mevaqesh Jul 13 '15 at 19:51

Only a mamzer who is halachically classified as a mamzer "doesn't live" (2 witnesses). Mamzers who are questionably mamzers survive.* Rab Yehudah says in the future those uncertain-mamzers will be kosher Jews that Eliyahu won't have to sort through. (Whereas if R. Yehudah had not posseked that way, then Eliyahu would have had to remove the bunches and bunches of them in the time of meshiach.)

* http://dafnotes.blogspot.com/2007/07/mamzer-will-not-survive-yevamos-78-daf.html

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But Klapei Shamay Galya who's a Mamzer and who's not – Shmuel Brin Jul 13 '15 at 7:22

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