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> about 5% of ecommerce shops refuse to accept it

That's surprising to me because there is nothing particularly weird about your email address. What exactly do they complain about?

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I would assume because it's only 2-chars (me) and they're filtering anything <3 as invalid.

Yeah, that's what I would guess as well. But there's a big difference between "follow the [ridiculously complicated] spec to the letter" and "don't do obviously stupid things like filter out email addresses with short names". The latter is good advice, the former not so much IMHO.

For a couple glorious years I had a 2-letter email address at a single-letter .com domain. It was rejected a surprisingly small number of times.

Ah, that's a good assumption. My initial assumption was some sites have a very dumb whitelist of valid email domains. This seems more reasonable (although, also dumb).

Quotes included or not?

Not. Obviously, or the rejection ratio would be a lot higher than 5%.

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