[Cialug] Qwest subtly filtering port 25

[lister at kulish.com]

I haven't noticed any filtering going on my DSL line from Qwest on any 
port.

On Tue, 31 May 2011 15:18:12 -0500, David Champion wrote:
> Just use port 587, and it should work for you.
>
> http://www.ietf.org/rfc/rfc2476.txt [7]
>
> -dc
>
> On Tue, May 31, 2011 at 3:10 PM, Matthew Nuzum  wrote:
>
>> This is an interesting move. Presumably this is because more and
>> more _residential_ users are switching to a web-based mail system
>> like hotmail and gmail. Leaving the bulk of the smtp traffic to be
>> spam sending malware.
>>
>> Does this service effectively prevent the use of a native smtp
>> client or does it just prevent the client from using other smtp
>> servers besides Qwest's? I would guess that qwest would allow users
>> to continue using the qwest mail server. However the problem I've
>> always run into is that if you're using a mobile device then you
>> can't send mail unless you're at home, on the ISPs network.
>>
>> A few years ago Verizon's residential DSL service in Florida had a
>> different policy. They declared all smtp traffic to be for
>> businesses and residential users weren't allowed to make SMTP
>> connections to any server except theirs unless you upgraded to the
>> business DSL package. Do you think this is the motivation of Qwest?
>>
>> On Fri, May 27, 2011 at 4:18 PM, Tim Perdue wrote:
>>
>>> Not sure if anyone else ran into this, but it had me vexed all
>>> week. I have used thunderbird for years from home to relay off an
>>> outside server and it just quit working and starting giving an
>>> error about SMTP timeout.
>>>
>>> Turns out Qwest has done some sort of subtle blocking of port 25
>>> that causes SMTP to timeout, although the port appears to be open
>>> (you can telnet to it).
>>>
>>>
>>
> 
> http://mikedopp.com/2011/bold-move-from-qwest-to-block-port-25-traffic/
>>> [1]
>>>
>>> A call to tech support got them to drop the filtering within a
>>> few minutes and my email works again.
>>> _______________________________________________
>>> Cialug mailing list
>>> Cialug at cialug.org [2]
>>> http://cialug.org/mailman/listinfo/cialug [3]
>>
>> --
>> Matthew Nuzum
>> newz2000 on freenode, skype, linkedin and twitter
>>
>> "Opportunity is missed by most people because it is dressed in
>> overalls and looks like work." -Thomas Edison
>>
>> _______________________________________________
>> Cialug mailing list
>> Cialug at cialug.org [5]
>> http://cialug.org/mailman/listinfo/cialug [6]
>
>
>
> Links:
> ------
> [1] 
> http://mikedopp.com/2011/bold-move-from-qwest-to-block-port-25-traffic/
> [2] mailto:Cialug at cialug.org
> [3] http://cialug.org/mailman/listinfo/cialug
> [4] mailto:cialug at perdue.net
> [5] mailto:Cialug at cialug.org
> [6] http://cialug.org/mailman/listinfo/cialug
> [7] http://www.ietf.org/rfc/rfc2476.txt
> [8] mailto:newz at bearfruit.org