I use a program from mightyblue.com called SMWhiteListFromSPF. It's a free program that pulls SPF records for the domains you want to bypass greylisting. I started using it years ago to fix ebay and have since added google, msn, yahoo and state lotto sites. I run it once a month and let it remove stale entry's and put the new entry's in the SM whitelist. Works on SM ver 15, no clue on Ver 16 since I'm not ready to update yet.
Junk Email filtered ISP