I explained I would review all the avenues to get a yes and if the answer had to be "no" then that would be the clear and concise message I would deliver. No blaming, no excused, I would present a supportive and final company decision.
What sort of things do you like to write about? And when you do, do you enjoy a smooth reliable writing utensil? This is for you! My biggest weakness is that I take too much time providing customer service for clients to make sure they are happy. Some of that time could probably be spent acquiring new customers.
I would start at the beginning and work my way forward until I found where the error was. Continually checking the system database as I went forward to see my progress and make sure I was bringing the whole system up and not leaving a portion out.
Calmly. Locate and fix using the half-split method; whether that is with teams in broad geographically spanning systems or within a single functioning system
SMTP port 25 is usually where you would look first. For Verizon they use a different port. 465. The difference is in the range of the octets. private IP ranges from (class A)10.0.0.0-10.255.255.255, (class B)172.16.0.0-172.31.255.255, (class C)192.168.0.0-192.168.255.255. These are used "inside". The other address ranges (first octet) 1-127, 128-191, and 192-254 excluding the ones mentioned above are considered the Class A, B, C public ranges. The other two questions about Irate customers and above and beyond are subjective. My advice is breathe deep and be nice, ALWAYS be nice.
With Rational Modeler, one can keep different artifacts (use cases, activity & sequence diagrams, etc) in a package. This means it has more integrated approach since dependencies among different artifacts are reflected as compared to Visio that treats every artifact independent of other artifacts.