While most stamps are now self-adhesive, most envelopes still require moistening the adhesive in order to seal it. Is it a kashrus problem to lick the envelope's adhesive?

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Per dinonline there is no Kashrus concern with licking an envelope.

Per Halacha Berura - Rabbi Belsky - Page 3 there is no concern during the year, however on Pesach one should be stringent since the paste may contain wheat starch.

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    Why should wheat starch matter? If it isn't food, then it isn't food. – Double AA Dec 31 '12 at 15:05
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    @GershonGold, then why does its food status not matter the rest of the year? – Seth J Dec 31 '12 at 15:14
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    @SethJ If you look at the link it explains that there is no Tarfus, however there is a wheat starch – Gershon Gold Dec 31 '12 at 15:16
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    So he's saying it is food all year, just it is usually made of kosher ingredients. That's pretty strange, as your first link says, because the taste is clearly pagum, nor are you trying to eat it. – Double AA Dec 31 '12 at 15:17
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    The first link disagrees with the reasoning of the second link, however they both agree that it is allowed during the year. They disagree regarding Pesach. – Gershon Gold Dec 31 '12 at 15:18

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