Mailing List Archive: Qmail: users

Bellsouth Port 25 blocking

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felixtheratruns at gmail

Aug 8, 2010, 3:06 PM

Post #1 of 5 (1066 views)
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Bellsouth Port 25 blocking

Short version: What is the best way to get around bellsouth's port 25
blocking to run a mailing list?
I would like to route it through their mail server or "smarthost" as I
hear it called.
This is an example of it with sendmail but I am not sure how to do it
with qmail: http://www.mjs1.com/?tag=stmp-mail-server-sendmail-linux-bellsouth-home-dsl
Thanks in advance.

Long version: So I have a server running qmail at my friend's house
under the bellsouth isp. Bellsouth has port 25 blocking (I know it is
outbound, but I am not sure if they also block inbound or not). And I
can send messages from the root account to myself and from myself to
myself (on the server) but I cannot send to (or receive messages from)
other email addresses not on my server. I can also telnet (from my
server) to mail.bellsouth.net and send email to other accounts. (I
haven't tried sending email to the accounts on my server

joel [at] themi:~$ telnet mail.bellsouth.net 25
Trying 207.115.11.17...
Connected to mail.bellsouth.net.
Escape character is '^]'.
220 isp.att.net - Maillennium ESMTP/MULTIBOX frfwmhc06 #63

I have found several sites that suggest things like changing the port
number http://www.interworx.com/forums/showthread.php?t=101 but the
closest to my setup (i've found) is this guy trying to do something
with having his own server (on another domain) to forward email
through, so I don't know how to make it work for me.
Thanks again.

Jason.Haar at trimble

Aug 8, 2010, 4:00 PM

Post #2 of 5 (1035 views)
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Re: Bellsouth Port 25 blocking [In reply to]

On 08/09/2010 10:06 AM, Joel wrote:
> Short version: What is the best way to get around bellsouth's port 25
> blocking to run a mailing list?
> I would like to route it through their mail server or "smarthost" as I
> hear it called.

echo ":bell.south.smtp.server" > /etc/qmail/control/smtproutes

Anything not defined as local will be routed through
"bell.south.smtp.server"

Googling for "qmail smarthost" would have also answered your question...

--
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1

johnl at iecc

Aug 8, 2010, 4:15 PM

Post #3 of 5 (1038 views)
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Re: Bellsouth Port 25 blocking [In reply to]

>other email addresses not on my server. I can also telnet (from my
>server) to mail.bellsouth.net and send email to other accounts. (I
>haven't tried sending email to the accounts on my server

It's very easy to set up qmail to use a smarthost. Put this line
into /var/qmail/control/smtproutes

:mail.bellsouth.net

That tells qmail that the default route is to the Bellsouth server.

If they want mail on port 587 rather than port 25, just add the port
number

:mail.bellsouth.net:587

That's reasonably likely to work. Some ISPs want you to use authentication
when sending mail, i.e., log in to their mail server before sending. That's
harder, qmail out of the box can't do it but I believe there are patches
floating around that can.

R's,
John

feh at fehcom

Aug 9, 2010, 12:33 AM

Post #4 of 5 (1032 views)
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Re: Bellsouth Port 25 blocking [In reply to]

Hi,

Am Sonntag, den 08.08.2010, 23:15 +0000 schrieb John Levine:
> >other email addresses not on my server. I can also telnet (from my
> >server) to mail.bellsouth.net and send email to other accounts. (I
> >haven't tried sending email to the accounts on my server
>
> It's very easy to set up qmail to use a smarthost. Put this line
> into /var/qmail/control/smtproutes
>
> :mail.bellsouth.net
>
> That tells qmail that the default route is to the Bellsouth server.
>
> If they want mail on port 587 rather than port 25, just add the port
> number
>
> :mail.bellsouth.net:587
>
> That's reasonably likely to work.

No, it doesn't. Port 587 is reserved for Submission only, which requires
SMTP Authentication.

> Some ISPs want you to use authentication
> when sending mail, i.e., log in to their mail server before sending. That's
> harder, qmail out of the box can't do it but I believe there are patches
> floating around that can.

Yes. You can use mine: http://www.fehcom.de/qmail.html

regards.
--eh.

>
> R's,
> John
>

--
Dr. Erwin Hoffmann | FEHCom | http://www.fehcom.de

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johnl at iecc

Aug 9, 2010, 8:57 AM

Post #5 of 5 (1029 views)
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Re: Bellsouth Port 25 blocking [In reply to]

>> If they want mail on port 587 rather than port 25, just add the port
>> number
>>
>> :mail.bellsouth.net:587
>>
>> That's reasonably likely to work.
>
>No, it doesn't. Port 587 is reserved for Submission only, which requires
>SMTP Authentication.

Depends on the network. Some (mine for example) require SMTP
authentication when connecting from outside the network, but not for
connections from inside.

RFC 4409 sec 3.3 discusses various approaches to authorized
submission.

R's,
John

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