Yet another reason not to use Verizon.
On Aug 3, 2007, at 11:11 AM, Helmut Fritz wrote:
Not sure how many of you are aware...but I have recently (over the
last two
weeks) discovered that Verizon DSL subscribers get port 25
hijacked. This
took me much time to figure out as I am swamped at the day job - so
it took
about two weeks to resolution. This is probably old news to most
of you
though...and I am sure there are other ISP's that do the same thing
to some
extent.
Verizon hijacks port 25 and redirects it to their mail server
regardless of
the ip/FQDN you have set up for your client's smtp server. This was
discovered by checking the client's smtp log (had to turn it on in
outlook)
and comparing the results. The smtp response was not my server! :)
Next we tried entering the users Verizon credentials to see if they
could
use the Verizon smtp server. No go, your from: field has to be
<user>@verizon.net or your domain is hosted by Verizon.
It is interesting that this was working from the client's home
prior to two
weeks ago, and one of their other accounts with a different smtp
server was
working for a while during this two week period. It seems that
Verizon may
monitor smtp outgoing traffic and arbitrarily (or target 'high'
useage)
hijack particular smtp server traffic. During the last few days the
client's second smtp server traffic stopped functioning as well...
I am very happy that the submission port is there and functional!
I might just get rid of Verizon for my cell service now. This is
really
irritating.
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George E. Nichols
"The universal aptitude for ineptitude makes any human accomplishment
an incredible miracle."
