[Chapter-delegates] Blocking port tcp/25 outgoing

[Franck Martin]

Many providers are now blocking port 25 by default. 

See recomendation from http://www.maawg.org/port25 

The big ISPs are members of MAAWG, ISOC is a affiliated to MAAWG 




Franck Martin 
http://www.avonsys.com/ 
http://www.facebook.com/Avonsys 
twitter: FranckMartin Avonsys 


----- Original Message ----- 
From: "Gaurab Raj Upadhaya" <gaurab at lahai.com> 
To: "Marcin Cieslak" <saper at saper.info> 
Cc: "Chapter Delegates" <chapter-delegates at elists.isoc.org> 
Sent: Tuesday, 10 November, 2009 7:22:30 PM GMT -08:00 US/Canada Pacific 
Subject: Re: [Chapter-delegates] Blocking port tcp/25 outgoing 

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Marcin, 

- From what I know, a lot of ISPs use this as a standard practice for 
their home/dsl/broadband subscribers who are on dynamic IP addresses. I 
know that my ISP doesn't allow third party SMTP servers to be used. They 
provide a SMTP server for all customer. 

If I want to run my own SMTP out then they ask me to upgrade to a 
'professional' plan for a small fee and will give me fixed IP among 
other other benefits. 

Operationally, this is one of the best ways to limit outbound badness 
from your network. Increasingly as more and more spam and badware is 
sent from virus infected or bot controlled - broadband connected - home 
PCs, and there aren't many ways to stop that from going out. 

In fact, limiting port 25 access is one of the recommended ways to 
dealing with badware. 

I personally don't think ISOC should be involved in specific 
technological choices of ISPs. I'd be very worried and concerned if the 
ISP hadn't provided other options to send /receive mails. In fact, ISOC 
chapter should be more involved in educating the customers to 
upgrade/update their virus definitions, not leave their PCs connected 
when they are not online, not install random bits of software.. etc.. etc. 
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