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For port 80 info, see: »Verizon Online FiOS FAQ »What about Port 80 - is it blocked?

Outbound port 25 has been blocked on and off in the past, most recently blocked again effective 6/1/10. Inbound port 25 is currently open. Even if port 25 is not blocked, Verizon's dynamic IP addresses are listed in both the Spamhaus Policy Block List (PBL) and MAPS DUL. 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. Which ports are blocked may change in the future.

No ports are blocked on business accounts with static IP addresses.

Please use the feedback link below only to suggest improvements to this FAQ. If you have questions about this FAQ, please post them in the »Verizon FiOS forum.

Feedback received on this FAQ entry:
  • If dates are to be included, then you might want to see this. According to this thread blocking port 25 officially started back on 8/2009; see nycdave's follow-up post about it being rolled out gradually everywhere.

    2010-06-12 10:15:59 (darcilicious See Profile)

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by FiosDude5 See Profile edited by More Fiber See Profile
last modified: 2011-05-09 21:19:25