Unable to send messages

[Sruli Saurymper]

use this guide to secure kolab 
https://docs.kolab.org/howtos/secure-kolab-server.html I use 
letsencrypt.org for certificate.

On 21/03/16 22:45, Sultan Ghaznawi wrote:
> Thanks Sruli, I will try to use SSL as well. Is it easy to switch to SSL? I
> haven't ventured into that area yet.
>
> Sultan
>
> -----Original Message-----
> From: Sruli Saurymper [mailto:sruli at saurymper.com]
> Sent: Monday, March 21, 2016 6:32 PM
> To: users at lists.kolab.org
> Subject: Re: Unable to send messages
>
> 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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