I would like to note that your website restricts and disallows absolutely valid email addresses, in particular mine. I respectfully request that you update your sites email checks to allow valid email addresses which may not be particularly regular, but are absolutely valid.
I have included the requirements for email addresses along with their standards reference in RFC definitions.
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An e-mail address consists of local part and domain separated by an at sign (@) character (RFC 2822 3.4.1).
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The local part may consist of alphabetic and numeric characters, and the following characters: !, #, $, %, &, ', *, +, -, /, =, ?, ^, _, `, {, |, } and ~, possibly with dot separators (.), inside, but not at the start, end or next to another dot separator (RFC2822 3.2.4).
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The local part may consist of a quoted string—that is, anything within quotes ("), including spaces (RFC 2822 3.2.5).
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Quoted pairs (such as @) are valid components of a local part, though an obsolete form from RFC 822 (RFC 2822 4.4).
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The maximum length of a local part is 64 characters (RFC 2821 4.5.3.1).
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A domain consists of labels separated by dot separators (RFC1035 2.3.1).
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Domain labels start with an alphabetic character followed by zero or more alphabetic characters, numeric characters or the hyphen (-), ending with an alphabetic or numeric character (RFC 1035 2.3.1).
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The maximum length of a label is 63 characters (RFC 1035 2.3.1).
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The maximum length of a domain is 255 characters (RFC 2821 4.5.3.1).
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The domain must be fully qualified and resolvable to a type A or type MX DNS address record (RFC 2821 3.6).
Until this is fixed I cannot sign up with your site and it displeases me that I will be missing out on the content your site can provide.