Earth to someone with a clue at Verizon mail operations

Earth to someone Verizon... Earth to verizon... Come in verizon.... come in
Verizon... We have an urgent message for you -

  This is called mail debugging 101.

    upon a successful authentication to your POP servers, the POP
    servers claim that there is no mail in the inbox while your
    webmail shows dozen of new unread unopened messages, (you
    are presented the printout of a telnet session to port 110

    the claim that it is the "MTU on a customer DSL router" that
    is causing the problem is wrong especially if the problem
    manifests itself on a NON-DSL connection. Making these
    claims for several days after three levels of escalation
    makes your well-ran operation look incompetent.