IBMMAIL.COM is not a dial-in mail  account service but a gateway to IBM's
inter-enterprise  network, which  is  mostly based  on  PROFS/OV. The  79
characters limitation  is due  to PROFS  and IBM can't  do much  about it
(unless you meant they *truncate* data past column 79 rather than folding
it,  in which  case they  definitely should  fix it).  I think  the error
message should  be sent to the  recipient rather than the  sender. If the
recipient feels this is a problem  he can always contact the sender after
the fact.  If this is  not possible,  the following MAIL  FROM: addresses
should trigger the removal of the message:
 
LISTSERV@*
owner-*@*
*-request@*
 
  Eric