jra@baylink.com said:

But is this actually true? I haven't tried it, but I thought sendmail still treated LHS's as case-sensitive...

Depending on your rewrite rules, sendmail can be either case sensitive or case insensitive.

Exim also has a choice:-

locally_caseless Type: boolean Default: true Domains in mail addresses are specified as being case-independent, but this it not true of local parts. For most Unix systems, however, it is desirable that local parts of local mail addresses be treated in a case-independent manner, since most users expect that mail to OBailey and obailey, for example, will end up in the same mailbox. By default, when it is processing an address whose domain is local, Exim lower-cases the local part at the start of processing, on the assumption that account names in the password file are in lower-case.

For installations that want to draw case distinctions, this option is provided. When turned off, local local parts are handled verbatim during delivery. If there are names containing upper case letters in the password file, the most convenient way to provide for caseless mail delivery is to set up a smartuser director as the first director, and to make it do a lowercased lookup of the local part, in order to translate it to the correctly cased version, using the new_address option.

There is a special place in hell reserved for those that use mixed case usernames on Unix and also expect caseless operation.

Nigel.

-- [ Nigel Metheringham Nigel.Metheringham@InTechnology.co.uk ] [ Phone: +44 1423 850000 Fax +44 1423 858866 ] [ - Comments in this message are my own and not ITO opinion/policy - ]