>>>>> "JRA" == Jay R Ashworth <jra@baylink.com> writes: JRA> The controlling paragraphs are 2.4 and 4.1.2 in RFC 2821, JRA> both of which specify that a local-part may be case JRA> sensitive. JRA> IE: oops. :-} No oops on Mailman's part! We case preserve for the benefit of the receiving smtpds, but I think it's perfectly valid for Mailman to case-fold subscription keys. -Barry