On Mon, Jan 28, 2002 at 02:06:39PM -0500, Jason Kohles wrote:
> Nope, in fact RFC 822 requires that case in the local-part of addresses
> be preserved, with the exception that the postmaster address must be
> deliverable regardless of case. Most mailers by default do not distinguish
> case as being important, but the RFC does allow them to if they wish.
Just for completeness, this is actually from RFC 2821 (obsoleted 821)
section 2.4:
Verbs and argument values (e.g., "TO:" or "to:" in the RCPT command
and extension name keywords) are not case sensitive, with the sole
exception in this specification of a mailbox local-part (SMTP
Extensions may explicitly specify case-sensitive elements). That is,
a command verb, an argument value other than a mailbox local-part,
and free form text MAY be encoded in upper case, lower case, or any
mixture of upper and lower case with no impact on its meaning. This
is NOT true of a mailbox local-part. The local-part of a mailbox
MUST BE treated as case sensitive. Therefore, SMTP implementations
MUST take care to preserve the case of mailbox local-parts. Mailbox
domains are not case sensitive. In particular, for some hosts the
user "smith" is different from the user "Smith". However, exploiting
the case sensitivity of mailbox local-parts impedes interoperability
and is discouraged.
Where "local-part" is defined as:
local-part@domain
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