ER> Tested the change by changing $area to $toarea in that, resulting in the
 ER> same thing. 

Try this instead.

if ($area eq "NETMAIL" && $toaddr eq
"1:135/300" && $toname eq "Eric Renfro" {
  $toaddr = "1:135/371";
  $change = 1;
  return "";
}

|15frank |08// |15netsurge
|07disksh0p|08!|07bbs |08% |07bbs.diskshop.ca |08% |07mystic goodness 
|11SciNet |03ftn hq |08% |07https://diskshop.ca/scinet

--- Mystic BBS v1.12 A43 2019/03/02 (Linux/64)