How many e-mail addresses are there?
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M$3 Answers
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M$
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M$I will not count International Domain Names, so this will tell you how many non International email addresses there are.
64^56 + 255^37
The 255^37 is because there are 26 letters in the alphabet, plus 0-9 in numbers, and a single dash is allowed as well.
The part before the @ is much harder, since an absurd amount of characters are allowed.
Uppercase and lowercase English letters (a-z, A-Z)
Digits 0 through 9
Characters ! # $ % & ' * + - / = ? ^ _ ` { | } ~
Character . provided that it is not the first nor last character, nor may it appear two or more times consecutively.
Worse, you can even use a huge number of other characters, as long a you quote them (ie: "John Doe"@example.com).
I count 56 base valid characters, so 64^56.
(64^56) + (255^37)
It is a huge number, larger than is easy to comprehend. More or less, infinite.
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