I have users/board members that come on campus and need to get mail through applications like the built in mail client on a Mac or from a FirstClass mail server. In this instance the ports they need to communicate with are 995 and 510 respectively. We have a rule allowing all outbound traffic but I can't seem to get configured correctly for them to send and receive mail through these apps. Any ideas?
What does your traffic log identify the blocked flows as?
TCP995 I think should be regular SSL (thats what Google uses at least), which should be appid:ssl unless you use ssl-termination (because then the appengine should be able to identify what flows within the ssl). I see that gmail has its own app so perhaps ssl is included there too.
TCP510 already exists as an appid:firstclass which should apply for your case (there are other apps using the same port so perhaps appid is misfiring in your case?).
You can also search for which apps uses the ports by just typing the portnumber and hit search:
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