Off-topic: Which RFE says: "Be forgiving for incoming data but be strict for outgoing data ?"

Good morning !

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Sorry for the off-topic question:
Which RFC says that an application should be "forgiving" for incoming
data but be "strict" (e..g maxmimum conformance to the "standard") for
outgoing data ?

I have to write a small article and like to quote that - but I don't
like to read ~2000 RFCs first ;-(

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Bye,
Roland

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