We upgraded our IronPorts to AsyncOS 5.5 two weeks ago and over the past week, an issue has begun to manifest itself. We are wondering if anyone else has seen this.When sending to some domains (at this point about 20 or so) we receive error response...

I've been playing around with filters for credit cards and have yet to find one that stops all credit cards while limiting false positives because it is matching any random 16 characters.I need one that blocks all amex, visa, mc, and discover without...