Ports 80 and 135 are blocked inbound.
However, although port 25 is not "blocked", Verizon's dynamic IP addresses are listed in the Spamhaus Policy Block List (PBL). The PBL is/can be used by mail exchange servers (MX's) to reject connections from these addresses. Thus, for the purpose of running a mail exchange server port 25 is effectively blocked. However, a mail server can be run that utilizes Verizon's authenticated SMTP just like your mail client would do.
As always, YMMV. It has been reported that sometimes a port which should be blocked by standard Verizon policy has instead been left open. In the past port 25 was blocked. Which ports are blocked may change in the future.
Thanks to N O Y B  for recent scan of ports 1 to 1030 to verify current status.
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by FiosDude5 edited by birdfeedr
last modified: 2009-01-23 15:01:21 |
