How should I write an email address? Are capitals OK?

Frequently Asked Questions about English

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EC
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How should I write an email address? Are capitals OK?

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How should I write an email address? Are capitals OK?

An email address consists of:

username + @ + domain name

You can write an email address with CAPITAL LETTERS or with small letters, or with a mixture of the two. For example, JustAnExample@SITE543.COM and justanexample@site543.com are the same.

Email addresses can contain:
  • letters of the English alphabet
    numbers 0-9
    hyphens -
    underscore _
    dots .
    plus of course the mandatory at sign @
You cannot use spaces.

For example, all the following would be possible:
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