07.04.26, 18:29 +0100, Joe: > I'm fairly sure that neither the SMTP protocol nor exim in particular > distinguish cases in email addresses. I have a feeling I found this for > sure with exim4, but I've run it for so many years I can no longer > remember the details.
I don't know anything about exim, but the SMTP protocol defines the local-part of an email address to be case-sensitive: | 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. 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. Mailbox domains follow normal DNS rules and are | hence not case sensitive. https://www.rfc-editor.org/rfc/rfc5321.html#section-2.4 -- Regards mks
