Hm, indeed. Unfortunately, it is not quite easy to find "the" new RFC, there was quite a number of correcting and extending RFCs issued over the last (almost) 30 years, which is not that surprising...
Are we going to do something about it? Is it likely that relaxing/changing the rules on our side will break any possible workarounds that people might have employed to make the search work like they want it to work?
Do you mean here workarounds to recognize such values as 'test@123-reg.ro' as an email address? Actually I do not see any workarounds except a patch to PostgreSQL.
No, more like disallowing '_' in the host/domain- names. Anyway, that is pure speculation on my part.
By the way, Teodor committed the patch yesterday.
I've seen that after posting my reply to the list ;-)