Topic: BigPond is blocking of Port 25.

[cosy]

Hi All,

  We are running a own mail server( exchange) and dynamic IP's with Dyndns.org, And also SME qmail working as a frontline mail server. So how can we configure our mail system.

Note:Port 25 will be blocked on 13th April 2004

Please help.

[jok11n]

Hi All,

  We are running a own mail server( exchange) and dynamic IP's with Dyndns.org, And also SME qmail working as a frontline mail server. So how can we configure our mail system.

Note:Port 25 will be blocked on 13th April 2004

Please help.

If you are using Bigpond ADSL you can pay the extra $10 and get a static I.P. and no blocked ports and also not have to worry about using dyndns (or better yet churn to a different provider, but that's a whole other story) Not sure if they offer the static I.P. on cable though. If not you have to get your server listening on other ports for your mail which is a lot of mucking around, not impossible, but it might be a simpler option to change to an isp that is server friendly.

[wykyd]

Yeah I would have to agree. Your best bet is to change ISP's, It can be done by changing what ports your server listens on, but honestly, this is telstra and they as an ISP are the worst.

I would seriously change

[VickTheViking]

I subscribed to this service and after 2 days could no longer authenticate to the Bigpond servers.  The usual 2 hour support call resulted in the expected "you are not running a supported configuration...blah blah blah"

You will find similar posts on the net.

Telstra Bigpond Static IP can be problematic to anyone attempting to connect via anything other than the supported client/ADSL modem options (this does not seem to include anyting Linux)

Change providers who support Linux PPPoE!

[jok11n]

I subscribed to this service and after 2 days could no longer authenticate to the Bigpond servers.  The usual 2 hour support call resulted in the expected "you are not running a supported configuration...blah blah blah"

You will find similar posts on the net.

Telstra Bigpond Static IP can be problematic to anyone attempting to connect via anything other than the supported client/ADSL modem options (this does not seem to include anyting Linux)

Change providers who support Linux PPPoE!

Have you changed your setup at all? You still need to connect via pppoe, the static I.P. is handled by the other end, not your server. From the servers point of view you are still connecting to a regular adsl connection only you will always receive the same I.P. address when you connect. It would still be better to change though, there are so many isp's doing better deals than telstra now.

[Anonymous]

Hi All,

  can some one give me temp solution like changing the SMTP port to 26 on frontline Qmail server?

  I try to change the ISP or Static IP but need quick temp solution

[Ed]

Even if you are able to change the listening port to 26, you will need to tell everyone sending you email to start sending it on port 26 instead of port 25.  In otherwords, you are out of luck!

Ed

[gbaird]

Hello

My isp blocks port 25 to try stopping spam I don't understand
what the are trying to stop as they let you use "their" mail server You might want to check it out with your isp

All the template changes are a pain My isp lets us use their smtp server so you simply just fill in the box on the email screen it says

Address of Internet provider's mail server

This works great for me the last year check with your isp

hope this helps

[Kelvin]

All the template changes are a pain My isp lets us use their smtp server so you simply just fill in the box on the email screen it says

Address of Internet provider's mail server

This lets your SME server send e-mails by passing it to the ISP's mail server for delivery.

However, if the ISP blocks any inbound SMTP traffic (port 25) as well as outbound SMTP traffic, your SME server will not be able to receive any e-mails unless you resort to multidrop mails again (yuks !) with the domain hosted externally.

Kelvin

[wyron]

However, if the ISP blocks any inbound SMTP traffic (port 25) as well as outbound SMTP traffic, your SME server will not be able to receive any e-mails unless you resort to multidrop mails again (yuks !) with the domain hosted externally.
Kelvin

Thats not necessarily so, Kelvin.
You just need to make your DNS-provider create an MX-record for your ISP's mail-relay server, with a higher preference-number (lower priority) than the one already there for your own MX-record.
That has worked for me with two different ISP's over a couple of years, since 'port25' became the new buzz-word among ISP's.

[big_gie]

You just need to make your DNS-provider create an MX-record for your ISP's mail-relay server, with a higher preference-number (lower priority) than the one already there for your own MX-record.
That has worked for me with two different ISP's over a couple of years, since 'port25' became the new buzz-word among ISP's.

Could you be more specific? I need to host a mail server to and port 25 is blocked...

How can I achieve this?

Thank you very much

[Medimo]

Same with direct-adsl of kpn in the Netherlands:

Primary MX : mail.yourdomain.com
Secondary MX : mail.relayserverofyourisp.com

Mail is sent to the primary record in dns. However, port 25 is blocked. Sender tries the backup server being the relay server of your isp. The relayserver then forwards the mail on its private net to your server.

So if there is a relay server, you can have your own mailserver without changing your configuration

[Anonymous]

Hi

First off let's clear something up.
Your ISP is not blocking port 25 or any other ports.
They are FILTERING the ports.

If they block the port you will not have any in/out
on that port period, the port is OFF, like off.

When they sent you the notice they probably used the word BLOCKED.

They can't block port 25 because that would deny you email service.

Typically an ISP may (some don't yet) filter port 25 inbound for Spam & AV.

They filter outbound 25 to check if the sender is using thier domain.

ie.

If you send mail out 25 it is sent using smtp-ISPdomain.xxx

If you send mail out 25 using MYdomain.xxx then their mail server will FILTER that and reject the request.

This is done to try and stop you from spamming and to stop the spammers from using your sys to spam.

You can however recieve mail on port 25 with mail.MYdomain.xxx, which proves they are not blocking the port.

So how can you send outbound 25 mail with mail.MYdomain.xxx?

SME server allows you to send mail.MYdomain.xxx out using your ISP's domain.

Server-Manager > E-mail > Delegate mail servers  > Address of Internet provider's mail server

Enter your providers smtp (outbound) server name here.

ie.  smtp.ISPdomain.xxx

I my case it is RoadRunner so it looks like this.

smtp-server.xxx.rr.com

Leave the > Delegate mail servers > Address of internal mail server > BLANK.

You don't have to use their inbound server, although you can if you want to take advantage of thier spam & AV filtering.

On the same note your ISP doesn't block port 80.... you would have NO WEB service AKA http, port 80 = OFF.

That might contradict with what your paying for (web access).

They can filter p80 but not block p80.

So can you have a webserver on p80, sure if they aren't filtering p80 for domain matching. Pretty hard for them to do, they would need your domain name or IP and then plug that into their filter list.

So in short the term BLOCKED is being used incorrectly and therefore most incorrectly understand what the problem is and the solution to the problem.

If you port scan 25, 80 and you have a firewall you should see those ports closed, until you put up a server on those ports.

So seeing closed ports 25, 80 doesn't mean your ISP is blocking those ports, it means your servers aren't
configed correctly.

Trying to config the servers correctly could drive you to drink.....but that's no excuse.

Have a good day all......

[electroman00]

Sorry for the above post
Login timed out again.

Also I might add, if you don't have a firewall and
ports 25 , 80 port scan open, then it's safe to say your a sitting duck..... like in quack...quack.

Later

[Kelvin]

Mail is sent to the primary record in dns. However, port 25 is blocked. Sender tries the backup server being the relay server of your isp. The relayserver then forwards the mail on its private net to your server.

So if there is a relay server, you can have your own mailserver without changing your configuration

I'd be most interested to know if Bigpond actually allows this. If Bigpond does not provide a relay server then, I do believe you're stuck. I'd be happy to learn of yet another way to accomplish this if there is one.

Kelvin

[Crome]

I have had a similar problem with my previous provider. As I too have a dynamic IP, I subscribed to a dynamic DNS provider namely No-IP.com. It is a payed service but I've used it for a few years now and it's great! One of no-ip.com's features is that they can redirect your mails to another port. So when mails are sent to my domain they arrive at no-ip.com (make sure your MX record points to no-ip.com). Then they send your mails to whatever port you'd like (825 for me). Works just fine. Another great benefit is that when my mailserver goes down, my mails are queued at no-ip.com.

And they don't even pay me for this...  

Cheers.

[big_gie]

You can however recieve mail on port 25 with mail.MYdomain.xxx, which proves they are not blocking the port.

So how can you send outbound 25 mail with mail.MYdomain.xxx?

SME server allows you to send mail.MYdomain.xxx out using your ISP's domain.

Server-Manager > E-mail > Delegate mail servers  > Address of Internet provider's mail server

Enter your providers smtp (outbound) server name here.

ie.  smtp.ISPdomain.xxx

I my case it is RoadRunner so it looks like this.

smtp-server.xxx.rr.com

Leave the > Delegate mail servers > Address of internal mail server > BLANK.

Hi electro,

The problem here is that we cannot RECEIVE mail... not sending them.
For exemple, if I login with the webmail interface (imp) for a user and send an email to testing@yahoo.com the email is send successfuly (via my ISP's smtp server)
But if I go to yahoo and send an email to webmaster@mysubdomain.dyndns.org I don't receive the email as my ISP's blocking/filtering port 25...

I also made some testing like this: I logging via ssh to my university account. I then try to telnet myself on port 25 (router is set ok, smtp is listeing to) but I get a timeout...

I even tryed to use dyndns.org's mail exchanger set to mysubdomain.dyndns.org; it accepted it, but I can't send an email to someone@mysubdomain.dyndns.org...

I want a solution

thanks for the reply.

big_gie

EDIT:
@Crome
What do you think about this service? Anyone knows of a free one? Cheaper one? Compared to dyndns.org's? It seems simpler... Anyone having a workaround?

[rotorbaru]

I can't receive emails either to SME 6.0, it was working and then stopped.  I can send email from webmail but not receive anything.  Any ideas?

[raem]

Just for the interest of readers of this thread see

http://bigpond.custhelp.com/cgi-bin/bigpond.cfg/php/enduser/std_adp.php?p_faqid=5562

Telstra clearly says it is only blocking outbound port 25

quote
"The first step is the closure of Port 25 on 13th April 2004.

Will BigPond be blocking both inbound and outbound Port 25?

The blocking will be occurring on outbound only."