Liviu Daia <daia(_at_)stoilow(_dot_)imar(_dot_)ro> writes:
On 9 November 1998, Jari Aalto+list.procmail
<jari(_dot_)aalto(_at_)poboxes(_dot_)com>
wrote:
RFC 1036:/2.1.1. From
Note that in all host and domain names, upper and
lower case are considered the same, thus
"mark(_at_)cbosgd(_dot_)ATT(_dot_)COM",
"mark(_at_)cbosgd(_dot_)att(_dot_)com", and
"mark(_at_)CBosgD(_dot_)ATt(_dot_)COm" are all equivalent.
User names may or may not be case sensitive, for example,
================================
... which means MTAs should preserve the case of usernames, since
the recipient system may fall into the "may" cathegory. :-)
...which sendmail does do for remote systems, unless you go out of your
way to break it in the sendmail.cf.
Philip Guenther