[Chapter-delegates] Blocking port tcp/25 outgoing

Alejandro Pisanty apisan at servidor.unam.mx
Tue Nov 10 22:00:17 PST 2009


Marcin,

as others have said, this is standard practice in many, many places. I 
join at least Franck Martin and Gaurab.

A few years ago it was applied in Mexico by the largest ISP/Telco and many 
other organizations followed suit. I was serving the community of my 
university, UNAM, with almost 300,000 students and 60,000 academics as CIO 
when we did it.

It is painful at the start; particularly the less-technical majority of 
users suffers a lot with the transition to the new scheme; the 
recommendation is to move to another port, as you correctly note it, and 
to force authentication each time the user sends an email through the new 
port (587 pretty usual.)

We prepared and distributed widely educational materials for users to 
change their email ports as well as to use webmail. In the long run this 
was a good decision.

I do not think that the ISOC chapter need get involved deeply.

Am I missing something? Are there reasons to oppose this measure in you 
case?



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      Dr. Alejandro Pisanty
UNAM, Av. Universidad 3000, 04510 Mexico DF Mexico

Tels. +52-(1)-55-5105-6044, +52-(1)-55-5418-3732

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*Participa en ICANN, http://www.icann.org
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On Wed, 11 Nov 2009, Marcin Cieslak wrote:

> Date: Wed, 11 Nov 2009 02:42:34 +0000
> From: Marcin Cieslak <saper at saper.info>
> To: Chapter Delegates <chapter-delegates at elists.isoc.org>
> Subject: [Chapter-delegates] Blocking port tcp/25 outgoing
> 
> Telekomunikacja Polska - the largest broadband Internet access provider in 
> Poland
> (and the incumbent telecom operator) plans to block traffic outgoing on the 
> tcp/25
> port effective December, 1st 2009. This port is used for the Simple Mail 
> Transfer
> Protocol (SMTP) traffic.
>
> Mail submission (tcp/587) from RFC 4009  and SMTP over SSL (tcp/465) are 
> going
> to be the recommended ways for their customers to send email using 
> third-party
> SMTP relays.
>
> This change will affect their home (consumer) DSL access customer, This will 
> affect I think over 2 million customers.
>
> 1. How many of providers in your region implement such a measure?
>
> 2. If so, do customers have an option to lift the block on request for their 
> access line? (Assuming customer authentication via MAC-address or PPP
> and variants is used).
>
> 3. How does that change influcence customers? Does that change limit
> amount of spam being sent, and if so, to what extent?
>
> 4. To all: Do you think local ISOC chapter should respond to blocking
> of SMTP traffic? If yes, how?
>
> --Marcin
> _______________________________________________
> Chapter-delegates mailing list
> Chapter-delegates at elists.isoc.org
> http://elists.isoc.org/mailman/listinfo/chapter-delegates
>



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