Let's get "real" -- there is no RFC that specifies a case sensitivity to
the right of the at-sign.  it is UNREASONABLE for every correspondent who
wants to mail your subscriber to figure out that the hostname has some
sort of case sensitivity i.e., this affects more than just you/your list.
Furthermore, mail to that address can be handled by any one of three
servers, some of which might not be properly configured:

Query:Mail Exchange (MX):POP3.MAIN-KINZIG.NET
Authoritative Answer
POP3.MAIN-KINZIG.NET    MX      15      pop3t.main-kinzig.net
POP3.MAIN-KINZIG.NET    MX      20      mail.gelnhausen.net
POP3.MAIN-KINZIG.NET    MX      10      pop3.main-kinzig.net
main-kinzig.NET NS      ns.rockbridge.net
main-kinzig.NET NS      ns.cw.net
pop3t.main-kinzig.net   A       195.243.232.5
pop3.main-kinzig.net    A       195.88.47.5
ns.rockbridge.net       A       206.151.4.1
ns.cw.net       A       204.70.128.1
Complete: POP3.MAIN-KINZIG.NET

Furthermore with appropriate forwarding support might be able to be
handled by MAIN-KINZIG.NET

Query:Mail Exchange (MX):MAIN-KINZIG.NET
Authoritative Answer
MAIN-KINZIG.NET MX      20      ns.rockbridge.net
MAIN-KINZIG.NET MX      10      mail.gelnhausen.net
main-kinzig.NET NS      ns.rockbridge.net
main-kinzig.NET NS      ns.cw.net
ns.rockbridge.net       A       206.151.4.1
ns.cw.net       A       204.70.128.1
Complete: MAIN-KINZIG.NET

If worse comes to worse, maybe the subscriber can

1) subscribe from two addresses: one which is receive-only (and different
from his existing subscription)

2) use the WEB interface:

http://MAELSTROM.STJOHNS.EDU/archives/faceblind.html
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