Re: Does anyone know how Verizon's outbound, external mail (port 587) is going to work?

["Don M. Blumenthal" <don () DONBLUMENTHAL COM>]

The outgoing port 25 issue has been around a long time. I'm amazed that it
has taken Verizon this long to catch up with other major ISPs in forcing use
of another port. In my experience, mail client users will have to change the
port manually.

Your users should be grateful, in a sense, that 587 is all that Verizon
requires. AT&T uses port 465 and won't pass messages with third party
addresses on unless the address has been registered and verified in their
system; good for security but a pain even for those of us who have
experience and applaud the approach.


-----Original Message-----
From: The EDUCAUSE Security Constituent Group Listserv
[mailto:SECURITY () LISTSERV EDUCAUSE EDU] On Behalf Of Peter Charbonneau
Sent: Thursday, September 24, 2009 8:17 AM
To: SECURITY () LISTSERV EDUCAUSE EDU
Subject: [SECURITY] Does anyone know how Verizon's outbound, external mail
(port 587) is going to work?

Good morning,

   I just read Verizon's "letter to the community" about blocking
outbound port 25 in order to decrease SPAM egressing their network.

hxxp colon slash slash www dot verizon dot net slash port25


   I am wondering exactly how this is going to work.  Do we punch
holes in our firewalls to allow tcp port 587 inbound to our mail
networks, or is Verizon going to port translate destination port 587
IN their network to port 25 as it leaves?  I have tried to talk to
Verizon tech support, but I either get "What?!?" or "It's all
explained in the document".  When I ask to talk to a supervisor, they
are unavailable.

   Does anyone here know?

PeteC


Peter Charbonneau
Sr. Network and Systems Administrator
Williams College
(413) 597-3408 (office)
(413) 822-2922 (cell)
OIT will NEVER ask for your password!