dstiles - 8:38 pm on Nov 29, 2012 (gmt 0)
It figures that G would abuse the spf system. :(
I've been wanting to ban G mail for a long time but my customers and their customers still insist on using it.
A while ago I began blocking all "bot company" IP ranges except for known bot IPs. This seems to block some "mobile" proxies but since Y and G seem to use these IPs indiscriminately, tough.