My guess is that one of your South African (.ZA) subscribers
is forwarding to an address in Mozambique (.MZ).
 
Temporarily (if you can't identify a unique .ZA subscriber),
issue the following to your LISTSERV@
 
SET MEDIA SHORT822 FOR *@.ZA
SET MEDIA SHORT822 FOR *@.MZ
 
Wait until something "bounces" with an explicit .ZA or .MZ
address which should identify your subscriber, then issue
 
DEL MEDIA bouncing_subscriber@host
QUIET SET MEDIA SHORT FOR *@.ZA
QUIET SET MEDIA SHORT FOR *@.MZ
 
--  co-owner:   INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
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