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Old 1 Apr 2004, 08:20 AM   #18
Essential Contributor
Join Date: Oct 2003
Location: Oslo, Norway
Posts: 344
Originally posted by Daniel S
RFC2821 (SMTP) states (Section 2.4):
(that local-parts are case sensitive)

Yes, that's true, but as the next passage says:


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.
So this just says that the mailserver must never change the case of the local-part when it receives a mail and hands it on to another mail server. Our mailserver (and pretty much every mailsystem connected to the internet) has case insensitive usernames (local-part).

So, regarding the whitelist question. I'm really surprised that a lower case mail address doesn't match the mixed case address. I'll have to check spamassassin to find out if this is expected behavior.
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