<p dir="ltr">On Mar 20, 2016 01:09, "Dmitrii Golub" <<a
href="mailto:dmitrii.golub@gmail.com">dmitrii.golub@gmail.com</a>>wrote:<br /> ><br /> > 2016-03-14 16:22
GMT+03:00Shulgin, Oleksandr <<a href="mailto:oleksandr.shulgin@zalando.de">oleksandr.shulgin@zalando.de</a>>:<br
/>>><br /> >> In fact, the 123-yyy.zzz domain is not valid either according to the RFC (subdomain can't
startwith a digit), but since we already allow it, should we not allow 123_yyy.zzz to be recognized as a Host? Then
whynot recognize aaa@123_yyy.zzz as an email address?<br /> >><br /> >> Another option is to prohibit
underscorein recognized host names, but this has more breakage potential IMO.<br /> >><br /> ><br /> >
Alex,actually subdomain can start with digit, <p dir="ltr">Not according to the RFC you have linked to.<p
dir="ltr">>try it.<p dir="ltr">What do you mean? Try it with ts_debug()? I already did, you could see me referring
tothis example above: 123-yyy.zzz<p dir="ltr">--<br /> Alex