Thanks for your answer. It seemed to work but after a while it stops itself again. The errors that I get are

Sep 9 12:54:13 hostname postfix/anvil[10237]: statistics: max connection rate 1/60s for (submission:82.221.106.233) at Sep 9 12:50:51
Sep 9 12:54:13 hostname postfix/anvil[10237]: statistics: max connection count 1 for (submission:82.221.106.233) at Sep 9 12:50:51
Sep 9 12:54:13 hostname postfix/anvil[10237]: statistics: max cache size 1 at Sep 9 12:50:51

And the stuff above of course.

It looks like you are having many connexions from smtp clients.
But those messages are not error messages, just statistics.

Could you gimme the output of :

ps fax
netstat -tunlp
postqueue -p

Those results may help me to find out what happens,

Thx

Yes sir here is the first one http://paste.ubuntu.com/8301455/ the second http://paste.ubuntu.com/8301467/ and the third http://paste.ubuntu.com/8301472/ Hope it helps :)

OK thank you.

From what I see here, I would say that all services are running fine (the netstat -tunlp confirms this to me), and I also see that some mails remained in the postque.

You can flush the queue to try re-sending the emails, and see if some errors appears in mail.log file :

postqueue -f

Flushing the mailq will force postfix to deliver mail again. As amavis is running now, the error you had in queue should not appear again :

(connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)

If the error message changes on call at postqueue -p, then you made a step forward ;)

Feel free to let me know if everything is fine after flushing the queue :)

--
rustx

Thanks I think its fixed now.. I also get a warning
warning: unknown[82.221.106.233]: SASL LOGIN authentication failed: UGFzc3dvcmQ6

Is it something I need to solve for the emails to work or does it not have to anything with that?

Ok now it stopped working again. I think its not blocked though because when I use the telnet command you gave it says

Trying 188.226.168.195...
Connected to pandapixl.nl.
Escape character is '^]'.
220 pandapixl.nl ESMTP Postfix (Ubuntu)

Glad to see you could move forward with the support and your mail server installation.

First, this trouble has nothing to see with the port blocking from DO, as the service is runing inside your droplet
.
Seeing the warning you show me, I understand you want to use Sasl authentication for login. But, from the paste you showed me before, I did not see saslauthd running.

You may try :

service saslauthd start

But saslauthd need to be configured properly, and relied to your postfix installation.

Did you configure saslauthd using a Mysql database to retrieve password ?

If it is the case, you will need to enable saslauthd by default when ubuntu is starting :

START=yes
OPTIONS="-r -c -m /var/spool/postfix/var/run/saslauthd"

Then, you will need to create a /etc/postfix/sasl/smtpd.conf file containing credentials to make a query in your database, and retrieve user authentication.

Feel free to tell me if you need more help on that setup.

--
rustx

Fine.
I can confirm your SMTP is working fine, as I could run a telnet on your mail server, and send and email to root ;)

Here is what I did :

Connected to pandapixl.nl.
Escape character is '^]'.
220 pandapixl.nl ESMTP Postfix (Ubuntu)
ehlo teknicity.net
250-pandapixl.nl
250-PIPELINING
250-SIZE 15728640
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
mail from:<rustx@my_own_mail.net>
250 2.1.0 Ok
rcpt to: <root@pandapixl.nl>
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
subject: test
mail testing from rustx
.
250 2.0.0 Ok: queued as DD08420A2F

This means the SMTP accepted the message for delivery, and it will transfers it to dovecot for delivery. If it worked well, you can log in as root and type mail in your shell : you will see my private message. :)

You should check in your logs that I did send you an email successfully.

There are many things to know about mail servers, as the DNS configuration needs to be extremely well done for it works well. If you need more information, I can help you with that setup.

See ya !

It says mail is not installed?

The program 'mail' is currently not installed. You can install it by typing:
apt-get install mailutils

@reshadfar : run apt-get install mailutils and then type mail and that will read that mail ... :)

Ok the root account doesn't have mail.. As I never created it. What else could the problem be for the connection breaking all the time?

IMHO, the problem is not on DO side. Setting a good and secured mail server up and running needs lot of knowledge about mail service, as it is a real complex setup. I advise you to have a look at the famous flurdy tutorials for mail servers setup : Flurdy

Once you will have configured all services needed, you should be fine with your mail server.

Have a good continuation on your setup !

Ah I Found the problem. The problem it was shutting down itself was because there was not enough space left on the ram ( Don't ask my how that was possible ) hmm got rid of some stuff and gonna check if it works now :) Thanks for the help so far

You're welcome ! amavis and spamassassin uses a LOT of Ram ... You will maybe need to upsize your container to have all those services working fine with the resources of your cloud. Enjoy and see ya !

@reshadfar : my mail to root had been bounced back, i've just received the bounce with the following error :

Status: 5.1.1
Diagnostic-Code: x-unix; user unknown

All is good then, it's time to create your first mail user ;)

++

Thanks for this. I have sent a ticket :)

Hmm the port doesn't seem blocked

Trying 188.226.168.195...
Connected to pandapixl.nl.
Escape character is '^]'.
220 pandapixl.nl ESMTP Postfix (Ubuntu)

Could the problem be somewhere else?

@reshadfar : this texts only show an incoming test. Teams from DO may block outgoing traffic, and not incoming traffic onlly. So this is a half test in your case ... Try to run the second one to see if you can connect to google smtp ...

What command is that exactly?

EDIT: I just received a email from them

Hello,

Thank you for contacting DigitalOcean Support.

We can confirm that we are not blocking smtp for your account.

We appreciate you being a Digital Ocean customer and please let us know if we can be of further assistance!

Regards,

So its not blocking the smtp ports. the problem should be elsewhere I guess