No Mail received/send. with fresh install Ubuntu 18.04 and Automated install ISPconfig

Hi, I just installed Ubuntu 18.04 with automated ISPConfig install.
I setup DNS, website and email domain with and mailbox.
Website is running fine with the Letsencrypt SLL.
I can login to Roundcube but I can not receive and send mails.

Where to start to solve this problem?

Thanks

 

Hi, I send in Roundcube a mail to another mailbox on this server, no succes. In Roundcube I get the Error "Server Failure"
In ISPConfig the mail log says

Code:

Jul 24 08:07:15 sever-macmini postfix/smtps/smtpd[7682]: SSL_accept error from unknown[45.13.39.12]: -1
Jul 24 08:07:15 sever-macmini postfix/smtps/smtpd[7682]: warning: TLS library problem: error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:332:
Jul 24 08:07:15 sever-macmini postfix/smtps/smtpd[7682]: lost connection after CONNECT from unknown[45.13.39.12]
Jul 24 08:07:15 sever-macmini postfix/smtps/smtpd[7682]: disconnect from unknown[45.13.39.12] commands=0/0
Jul 24 08:07:31 sever-macmini postfix/smtps/smtpd[6374]: connect from localhost[127.0.0.1]
Jul 24 08:07:37 sever-macmini postfix/smtps/smtpd[6452]: connect from unknown[45.13.39.12]
Jul 24 08:08:08 sever-macmini postfix/smtps/smtpd[6452]: SSL_accept error from unknown[45.13.39.12]: -1
Jul 24 08:08:08 sever-macmini postfix/smtps/smtpd[6452]: warning: TLS library problem: error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:332:
Jul 24 08:08:08 sever-macmini postfix/smtps/smtpd[6452]: lost connection after CONNECT from unknown[45.13.39.12]
Jul 24 08:08:08 sever-macmini postfix/smtps/smtpd[6452]: disconnect from unknown[45.13.39.12] commands=0/0
Jul 24 08:08:28 sever-macmini postfix/smtps/smtpd[7660]: SSL_accept error from mail128-20.atl41.mandrillapp.com[198.2.128.20]: Connection reset by peer
Jul 24 08:08:28 sever-macmini postfix/smtps/smtpd[7660]: lost connection after CONNECT from mail128-20.atl41.mandrillapp.com[198.2.128.20]
Jul 24 08:08:28 sever-macmini postfix/smtps/smtpd[7660]: disconnect from mail128-20.atl41.mandrillapp.com[198.2.128.20] commands=0/0

 

How did you secure you mail server at the first place?

 

I installed Ubuntu 18.04 with automated ISPConfig install. I followed the manual https://www.howtoforge.com/tutorial/ubuntu-ispconfig-automated-install-script/. I setup a client, add a DNS-Zone, setup a website, setup a mail. Website is working and I can reach Roundcube also. I get the "welcome" mail in Roundcube. But can not receive or send mails. In the server configuration I setup relais host mail.antagonist.nl:587 with the correct username/password.
I connect to the internet without a firewall, and the firewall in ISPconfig is not set.

 

Ok thanks Till, I compared the master.cf with the "perfect server tutorial" and changed the lines. Now it works again.

I have only one problem. When I checked my mail with MXtoolbox it says "SMTP Banner Check" "Reverse DNS does not match SMTP Banner" how can I solve this problem?

 

From what I remember using mxtoolbox, it explains the errors it finds and suggest what to do. Did this not happern for you?
To get rid that of warning, you need to create reverse DNS record for that mail hosts IP-number that matches the FQDN the host advertices in the SMTP Banner.
https://en.wikipedia.org/wiki/Reverse_DNS_lookup
https://www.howtoforge.com/tutorial...vice-with-ispconfig/#nbspreverse-name-service
What show commands

Code:

grep smtpd_banner /etc/postfix/main.cf

grep myhostname /etc/postfix/main.cf

 

Hi,
My main.cf says.
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
myhostname = server-macmini.XXX.nl

 

Ok, it works now I changed
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
to
smtpd_banner = $ myhostname ESMTP (Ubuntu). I search "myhostname" with "Reverse DNS Hostname Lookup"

Thanks

 

I do not understand your change. Are you quite sure you now have a working setup?

 

When I check with mxtoolbox.com, "check my email server" it says
"SMTP Banner Check OK - Reverse DNS matches SMTP Banner"