Unable to send messages

[Thomas Spuhler]

On Monday, March 21, 2016 04:35:09 PM Nathanael D. Noblet wrote:
> Ah yeah, I didn't know this wasn't a 'proper' server. Outgoing port 25
> is often blocked by residential ISP providers / plans.
> 
> So your only solution is to have a relay host somewhere publicly
> accessible and not listening on port 25 for example. You would then
> configure your internal postfix system to use it as a relay. Which is
> as simple as editing main.cf and setting 
> 
> relayhost = [external.host.com:1025] 
> 
> for example.
> 
> -- 
> Nathanael
> 
> On Mon, 2016-03-21 at 18:25 -0400, Sultan Ghaznawi wrote:
> > Hi Nathanael,
> >  
> > Thanks for the pointer, I checked my firewall and I have port 25
> > opened for bi-directional traffic. I am not sure about postfix
> > configuration as I kept everything as default during the Kolab
> > installation process. However, I believe Rogers (my ISP in Canada)
> > blocks port 25. I am not sure how that works since I am able receive
> > mail (delivered to Kolab box on port 25?).
> >  
> > Is there a way to use another port or a different protocol (e.g.
> > secure)?
> >  
> > Thanks,
> >  
> > Sultan
> >  
> > From: Nathanael Noblet [mailto:nathanael at gnat.ca] 
> > Sent: Sunday, March 20, 2016 10:58 PM
> > To: Sultan Ghaznawi
> > Cc: users
> > Subject: RE: Unable to send messages
> >  
> > Hello,
> >   So the only thing I can think is that somehow your firewall is
> > blocking outbound port 25 OR you've configured postfix to use a relay
> > host it can't reach. Try telneting to the MX server of the outbound
> > server you were testing to narrow it further?
> > Nathanael
> > On Mar 20, 2016 3:08 PM, Sultan Ghaznawi <shghaznawi at telusmail.net>
> > wrote:
> > Hi Nathanael,
> >  
> > Many thanks for your response. What you are suggesting is what I
> > thought of at the first place, however, I can ping any IP address
> > from that box without a problem and all other tools, such as yum,
> > curl, wget and everything else works. It seems the DNS is also set up
> > properly, the only thing that might be an issue is if for some reason
> > the firewall within the box is rejecting outbound requests from this
> > application on a specific port. I did run the port white-listing
> > command before installing Kolab.
> >  
> > Any other suggestions?
> >  
> > Sultan
> >  
> > From: Nathanael Noblet [mailto:nathanael at gnat.ca] 
> > Sent: Saturday, March 19, 2016 12:16 AM
> > To: Sultan Ghaznawi
> > Cc: users
> > Subject: Re: Unable to send messages
> >  
> >  
> > On Mar 18, 2016, at 9:20 PM, Sultan Ghaznawi <shghaznawi at telusmail.ne
> > t> wrote:
> >  
> > Hi Everyone,
> >  
> > I set up the Kolab 16 on CentOS 7 and everything went well. Here is
> > what is happening:
> >  
> > 1.       I can send/receive emails between internal users (my domain
> > within the box).
> > 2.       I can receive emails sent from outside my domain over the
> > internet
> > 3.       I am unable to send out messages. I send a message, I do not
> > get an error in the UI, the /var/log/maillog shows “network is
> > unreachable” and “timed out” messages. I ran the
> > “lmtptest google.com” command and it shows network unreachable error.
> >  
> > It sounds like the error is completely unrelated to kolab. Can the
> > server successfully resolve names? Does its default route work
> > outbound? Can you grab websites using curl or wget on that server? A
> > network unreachable error really seems unrelated to kolab or any
> > server system at all. Try narrowing down the issue. Perhaps dig
> > apple.com to see if you get an IP etc..
> >  
> > — 
> > Nathanael
> 
> _______________________________________________
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> users at lists.kolab.org
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If you have a static IP address, you may just ask your ISP to open port 25. 

-- 
Best regards
Thomas Spuhler

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