This does it:
NewString:='';
For i:=1 to length(mailstring) do
if mailstring[i]=' ' then NewString:=NewString+'%20' else
NewString:=Newstring+Mailstring[i];
//use the old bugger
Mailstring:=NewString;
ShellExecute(Application.Handle, nil,pchar(Mailstring),nil,nil, SW_SHOWNOACTIVATE);
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