Special-Format Email Addresses in Use — Not RFC Compliant

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Examples of Special-Format Email Addresses (Not compliant with RFC)

1. In cases where there is a period (.) immediately before the at symbol (@), such as ‘.@’
   • For example: tiger.@****.ne.jp
2. In cases where there is a period (.) at the start of the email address
   • For example: .tiger@****.ne.jp
3. In cases where there are consecutive periods (..) before the at symbol (@)
   • For example: ti..ger@****.ne.jp

What is RFC (Request For Comment)?
RFC (Request For Comment) is a set of international Internet technology rules (specifications and requirements) officially issued by the IETF, an organization that defines Internet technology standards.
However, Japanese carrier e-mails (au, docomo, etc.) allowed registration of e-mail addresses that violated the above RFC until April 2009. (After April 2009, registration is not allowed.)
Until November 2015, google had taken measures to allow sending to RFC-violating e-mail addresses only to ezweb and docomo, but as of November 2015, this measure has been removed, and the original specification is that sending to RFC-violating e-mail addresses is not possible.