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Streamyx TMNET Streamyx blocking outbound port 25, Can't send out email from email clients

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TSmytescocom
post Mar 28 2008, 07:41 PM, updated 18y ago

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Hi All,

For those streamyx users, are you aware that Streamyx is blocking outbound port 25?

http://www.streamyx.com.my/whats_new/whats...rticle_20080311

What this means is that if you are using any email clients - Outlook, ThunderBird to send emails out from Streamyx, you will be blocked.

This is extremely inconvenient for ppl working from home.

Please give your thoughts on this..

thanks.
TSmytescocom
post Mar 28 2008, 08:05 PM

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I know..it's old story.

I called up their CS in December, and they said they hav not implemented it.

Today, i have problems sending out email from outlook express, then i checked their website and found their latest announcement.

I know Spammers use TMNET to spam, but does that give TMNET the right to penalize everyone?

If next time, some one does a new technology "HTTP" hijacking, does that mean TMNET block port 80 for everyone and force all their suscribers to use their proxy?


There's a lot of antispam technology that can help TMNET fight their spam issue. They just need to find the right solution and not take the easy way by blocking outbound port25.

There will be a lot of SOHO ppl working from home that will be affected by this.
TSmytescocom
post Mar 28 2008, 10:54 PM

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Actually the Spam issue is more serious than one would normally perceive.

Even if TMnet gives us free AntiSpam software, the SPAM issue will still be there. TMNET's dynamic ip address would still be blacklisted by many AntiSpam solution in the market today.
AntiSpam solution works by a few ways- examining the email contents, DNS checkup and also compares the email's ip address.

So when TMnet user A with ip address ie 65.54.100.1, sents a lot of spam. AntiSpam solutions out there will soon blacklist this ip address. So when, a new TMnet user B gets this unlucky ip address 65.54.100.1, whenever he tried to sent emails (even valid emails), AntiSpam solution will detect it as SPAM as his ip address is already blacklisted.

http://www.blacklistedip.com/
TSmytescocom
post Apr 7 2008, 10:14 PM

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QUOTE(asellus @ Mar 28 2008, 11:04 PM)
If you are just using e-mail client like Thunderbird/Eudora this will not affect you. Do you run a SMTP server?
*
Hi,

Even if you use email clients like Outlook Express/ Thunderbird/ Eudora, you will still face this problem.
If you have outlook or thunderbird, when u define your email settings, you will see a setting for outgoing mail server. This is where port 25 will come into play.
When you configure for incoming mail server, you use pop3 or imap. Not SMTP.

I've already lodge a complaint/report to TM about this. We need more users to complain so that OUR voice can be heard!!


Added on April 7, 2008, 10:20 pm
QUOTE(rajulkabir @ Apr 7 2008, 06:47 PM)
To the contrary, I think it is a very good idea for them to do this. The vast majority of all spam comes from zombie PCs in people's homes that just make outbound connections on port 25.

That's a huge amount of traffic clogging TM's network, making everything slower for the rest of us. Not to mention the hassle that the spam causes.
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So does this means if the car accident rate increases, we shud just reduce the highway speed limit to 50km/h?? Because the highway has many potholes, and the authority has no means to fixed the potholes, we conviniently introduce a speed limit reduction to everyone?? Come ON!!

Eventhough spammers uses port25, but there are also alot of legitimate users out there that uses port 25 for real business purposes.
There are many methods to combat spam, but TM is taking the shortcut by just blocking port25. They just have the convenience of assuming that port25 is meant only for email servers.

Ppl like me where my company email server is in the US, i rely on my email client to be able to send emails out via port 25.



This post has been edited by mytescocom: Apr 7 2008, 10:20 PM
TSmytescocom
post Apr 10 2008, 12:42 PM

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QUOTE(asellus @ Apr 8 2008, 03:13 AM)
You are so wrong about this. If you have your own SMTP server, you can use them to send e-mails. You are not restricted into using TMNut SMTP servers only. Do you really think TM will block third-party POP/SMTP e-mail providers? If they do I will go straight to MCMC and make a complaint.

It is when you have SMTP server using Streamyx dynamic IP address then you will have problems. Now, did you run a SMTP server at home? Did TMnut block usage of non-TMNut SMTP servers? For the latter, it seems that they don't. I have my own SMTP server, running to receive traffic at port 25, and if TMNut blocked me from using it, there will be hell to pay. But TMnut did not, so who am I to complain?

And yeah, I support TMNut move to block home SMTP servers from being operated.
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Hi Asellus,

I think you do not know how SMTP operation works. Do you know that NOT only email server uses port 25 to send out emails? Email clients also uses port25 to send out emails back to their email servers.
email server to email server -port25, email client/user to email server can also use port 25.
Maybe there was a misunderstanding on the problem or you are not aware how email clients (outlook, thunderbird) works to sent emails back to their SMTP server.

I do not have an SMTP server at home. I'm only a user using Outlook Express to send emails back to my office email server in US. Previously my outlook clients uses port 25 for outgoing emails. Now i've changed it to use a different outgoing port. I'm forturnate my corporate email server supports an alternative port. For those that don't, they will have a tough time sending email out from a email client.

Please read and understand SMTP, SMTP auth
http://en.wikipedia.org/wiki/Simple_Mail_T...ail_SMTP_server
http://en.wikipedia.org/wiki/SMTP-AUTH
TSmytescocom
post Apr 13 2008, 09:44 PM

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QUOTE(ozs @ Apr 10 2008, 01:29 PM)
you're so wrong dude.. asellus was right..
yup you'll use port 25 for smtp.. we all know..
but from client you'll not be using port 25 for connecting to your mail server....
tmnet block all outbound smtp traffic
means all traffic from port 25..

i know you're really think when using email client u're using port 25..
play around with netstat while sending out mail then u know..
you're connecting to 25.. not from 25..

its same thing while u browsing..
did u really think u're using port 80 at your machine while browsing this forum(webserver)?..
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What i mean is outbound port 25. This means connecting to tcp port 25 on the email server.Please read the title of this topic.
email client (random port >1024) -----> internet ------> (port 25)email server.

What Asellus mean (as far as i interpret it) was he thought only email servers (MTA) uses outbound port25. What i was trying to relay the message is that email clients (outlook, thunderbird) also uses port 25 (outbound) to sent emails to mail servers.
So when TMnut blocks outbound port 25, this causes problems to email clients not only to those that host email servers.

Peace ..




 

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