> 
> The syntax of a legal Internet host name was specified in RFC-952
>      [DNS:4].  One aspect of host name syntax is hereby changed: the
>      restriction on the first character is relaxed to allow either a
>      letter or a digit.  Host software MUST support this more liberal
>      syntax.
> 
Is this compliant for the "Invalidate the format of HELO" regex?  

^\d+\.\d+\.\d+\.\d+$|^[^\.]+\.?$


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