Help Centre: Invalid email address
It is possible to see a message Invalid email address when registering.
There are a few possible explanations:
You might have typed or a space after the email address or you may have copy-pasted the address and it has a space at the end. To fix this, put the cursor after the end of the first email address and click backspace.
The email address you entered might have a comma instead of a dot somewhere.
There might be a top-level domain missing. To be valid, there must be at least one dot somewhere after the @.
The email address validation rules are:
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Must not contain a space.
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Must contain @
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Must contain alphanumeric characters, or underscores and hyphens only.
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Must not contain other special characters or apostrophe.
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Must contain at least one valid character before the @ and at least one character after the @ followed by a dot and then at least two characters after the dot.