only certain special characters allowed in email address.
Here are some special characters that are allowed in email addresses:
• Before the @ symbol
• The following characters are allowed before the @ symbol: numbers 0-9, uppercase letters A-Z, lowercase letters a-z, plus sign (+), hyphen (-), underscore (_), tilde (~), exclamation point (!), number sign (#), dollar sign ($), percent sign (%), ampersand (&), single quote ('), period (.), forward slash (/), equal sign (=), caret (^), accent mark, left curly brace ({), right curly brace (}), and vertical bar (|)
•
• Quoted
• A quoted string can contain any ASCII character from 0 to 177, excluding the quote and the carriage return.
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• Backslash
• A backslash can be used to quote any character and cause the following character to lose its special meaning. For example, to include a quotation character in an email address, place a backslash in front of the quotation character.