On Mar 20, 2016 01:09, "Dmitrii Golub" <dmitrii.go...@gmail.com> wrote:
> 2016-03-14 16:22 GMT+03:00 Shulgin, Oleksandr <
>> In fact, the 123-yyy.zzz domain is not valid either according to the RFC
(subdomain can't start with a digit), but since we already allow it, should
we not allow 123_yyy.zzz to be recognized as a Host?  Then why not
recognize aaa@123_yyy.zzz as an email address?
>> Another option is to prohibit underscore in recognized host names, but
this has more breakage potential IMO.
> Alex, actually subdomain can start with digit,

Not according to the RFC you have linked to.

> try it.

What do you mean? Try it with ts_debug()? I already did, you could see me
referring to this example above: 123-yyy.zzz


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