Mar 17 16:29:37 mydomain sm-mta[7516]: k2I0Ta4L007516: 
ruleset=check_rcpt, arg1=<filminfool@yahoo.com>, relay=[209.101.xxx.xxx], reject=550 5.7.1 <removed@removed.for.security.com>... 
Relaying denied. IP name lookup failed [209.101.xxx.xxx]