jav6, good effort to analyze our Verizon Messaging failures.
I hope this can help.
Maybe others with similar failures can use the links I've included.
My Verizon/Comcast messaging servers:
========== (Cell Phone ISP) ==========
Your ISP is Cellco Partnership DBA Verizon Wireless
========== (desktop/laptop Cable ISP) ==========
Your ISP is Comcast Cable Communications
also known as 'Comcast IP Services, L.L.C.'
and 'Comcast Cable Communications, LLC'
ISP : Comcast Cable
Organization : Comcast Cable
Type : Broadband
Continent : North America
Country : United States
State/Region : California
City : Palo Alto
Postal Code : 94301
My ISP : Comcast Cable
Country : United States (USA)
State : California
City : San Jose