Mail server not working with Postfix Dovecot

[robert rottermann]

On 07.12.2015 04:48, Mariano Jara Melagrani wrote:
> I'm running Ubuntu Server 14.04.3
>
> mariano at server1:~$ cat /etc/issue
> Ubuntu 14.04.3 LTS \n \l
>
> I want ro run my own mail server with my own domain, so I've installed
> Postfix and Dovecot following this guide:
>
> https://help.ubuntu.com/lts/serverguide/serverguide.pdf
>
> I've configured Thunderbird to receive and send mails from my mail
> server using my domain (mail.jaramelagrani.com.ar), but I'm not being
> able to receive or send mails. I've sent test mails, using Thunderbird
> and the web interface, from a Google and Hotmail accounts to my domain,
> but I'm not receiving them. Later on I've received at those accounts
> (Google and Hotmail) a Delivery Status Notification (Delay) message saying:
>
> "This is an automatically generated Delivery Status Notification
>
> THIS IS A WARNING MESSAGE ONLY.
>
> YOU DO NOT NEED TO RESEND YOUR MESSAGE.
>
> Delivery to the following recipient has been delayed:
>
>       mariano at jaramelagrani.com.ar
>
> Message will be retried for 2 more day(s)
>
> Technical details of temporary failure:
> The recipient server did not accept our requests to connect. Learn more
> at https://support.google.com/mail/answer/7720
> [(10) mail.jaramelagrani.com.ar. [181.230.43.12]:25: socket error]..."
>
>
> I've checked the logs and looked the errors up on DDG but couldn't find
> a solution.
>
> I've got ports 25, 110, 465 and 995 open, facing the internet, so I
> doubt this is a firewall issue. I don't know if my ISP is blocking those
> ports. I've sent them a message asking about it, but I haven't got a
> response yet.
>
> I've posted the logs and Postfix config at
>
> http://paste.ubuntu.com/13774193/
>
> I'm clueless so any pointers or help would be much appreciated.
>
> so am I..
when I have postfix questions I ask the following mailing list:
postfixbuch-users at listen.jpberlin.de

they are very knowledgeable about posfix and very helpful.
however, since it is a german list, I do not know whether they answer english 
questions.

robert