I've found some another little errors: each label of an hostname must be long at maximum 63 characters (RFC 1034 #3.1
), and it can't start or end with an hyphen (RFC 952
, under "Assumptions", modified by RFC 1123 #2
). Furthermore the entire length of an email address can't exceed 256 characters: RFC 5321 #188.8.131.52.3
I read all these informations from Wikipedia articles about email address and hostname syntax, but I verified them as you can read.