On 6 May 2018, at 16:21 (-0400), Billy Youdelman wrote:
On 6 May 2018, at 12:30 MST, Randall Gellens wrote:
I have address patterns set for my accounts, and discovered that when
a sender has an address for me in all upper case, MM does not
recognize it as matching the address pattern.
Call me crazy, I don't care, but ...
If this is actually a problem that needs a solution, I would like to
strongly suggest that forcing entire email addresses to lower-case is
not it.
It is a problem that needs some solution, because the local part of an
email address MAY be case-sensitive but usually is not. Complicating
that, 'postmaster' is ALWAYS case-insensitive, even on the rare mail
system that otherwise supports case-sensitive local parts.
The domain part of an email address is NEVER case-sensitive. The
canonical form of any non-IDN domain name is with all letters lower
case, so interop pretty much requires tolerance for others
case-squashing domain names, since that is definitively "Not Wrong."
(Which does not mean it is "Right.")
This is one of the more annoying things going on these days. For
example, try and find any third-party DNS provider that leaves
upper-case domain names alone. Little things mean a lot.
As a technical matter, ASCII-label domain names are case-insensitive. It
is a common practice for a nameserver to preserve the case of labels
between queries and responses but it would be unsafe to depend on that
behavior and outright wrong to provide different result data based on
the case used in a query. DNSSEC depends on a definition of the
canonical form of a domain name: all lower case.
If I didn't want mine upper-cased I would not have written it that
way.
That's nice. To get case-sensitive domain names, you'll need to find a
different Internet. :)
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Currently Seeking Steady Work: https://linkedin.com/in/billcole
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