Unable to send messages

[Sruli Saurymper]

Many ISP's block outbound 25, I use SSL so don't use port 25 for 
outbound at all, search the net for either changing postfix outbound 
port 25 or redirect port 25.

On 21/03/16 22:25, 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 
> <mailto: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.net <mailto:shghaznawi at telusmail.net>> 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 <http://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 <http://apple.com> to see if you get an IP etc..
>
> —
>
> Nathanael
>
>
>
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