On Fri, 2007-01-12 at 10:13 +0100, Marcus Better wrote: [...] > Shouldn't e-mail addresses be case insensitive?
Since you asked ;-) - no, at least for local parts (i.e. the portion preceding the @). In fact, they MUST NOT (in the BCP14 meaning of that phrase) be. From RFC2821: 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. What the likelihood is of two maintainer addresses actually being differently-cased versions of the same local part, on the other hand... Adam -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]