Strings formed with characters from a to z (uppercase or lowercase), digits from 0 to 9, !, #, $, %, , ', *, +, -, /, =, ...

Strings formed with characters from a to z (uppercase or lowercase), digits from 0 to 9, !, #, $, %, , ', *, +, -, /, =, ?, ^, _, `, {, |, } or ~. One or more periods may be embedded in an alias, but each one of them should be preceded and followed by at least one of the other characters. Unicode characters from U+00A1 to U+00FF are also valid in an alias, but they will be mapped to a best-fit US-ASCII string in the email address which is generated from such an alias
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