Problem with Custom DNS record and external mail server

After upgrading all 3 small vps from 1.2.11 or 1.2.9 to 1.2.17 I had to recall all external mail server config for each domain (i used all vps,only for website hosting) only 2 or 3 with email.

This morning I had some error with mail because all domains mail goes to wrong destination (localhost and not to external server. I already had configured all MX record, and they works correctly).

Problem is that some custom dns config cant be deleted or edited. I have to change and remove custom dns config in customer panel, then open customer, then redit the config.
For some customer it's ok, for other now I have 3 mx record and 2 of them I cant edit.
Plus I had this error by email:

Quote from server

Dear admin,An exception has been thrown in file/var/www/imscp/gui/library/Functions/Shared.php at line 2699:=================================================================SQLSTATE[42000]: Syntax error or access violation: 1064 You have anerror in your SQL syntax; check the manual that corresponds to yourMySQL server version for the right syntax to use near ')' at line 6Query was: SELECT * FROM domain_dns WHERE domain_dns_id IN() =================================================================Debug backtrace:---------------File: /var/www/imscp/gui/public/client/mail_external_edit.php at line361Function: execute_query()File: /var/www/imscp/gui/public/client/mail_external_edit.php at line551Function: client_editExternalMailServerEntries()Additional information:----------------------Http User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:44.0)Gecko/20100101 Firefox/44.0Request Uri: /client/mail_external_edit.php?item=6;normalHttp Referer: https://my.server.it:4443/client/domains_manage.php Remote Addr: 93.50.91.107Server Addr: 5.249.158.14____________________________________________________________i-MSCP Exception Mail WriterNote: You will not receive further emails for this exception in thenext 24 hours.

So my question is ,may i disable all dns in the server and setup the original dns ? so server read the right config.
Or, what is the table with wrong config ?
Any suggestion is great

Thx

First of all thx for reply and explanation.

I'm pretty sure I didnt edit file domain_dns table manually but only via control panel, but maybe I did some mistake there

To understand where is the error I just only ask to server where is the MX for each domain.

host -t MX example.com

When I see more then 1 record, I think there is error.

About ssh key, maybe I can give you root access directly o teamvewver ? I didnt setup access with key.
root pass is ok for me and I already work with mrpink without problem.

Right now server has 2 or 3 MX record for each domain but it works.
Now question:
1-There is no hurry about fix and there will be 2 server with about a total of 20 domains to check or fix. I can write to your email pass, server and domains ?
2 - in another local test server, I disabled to do some test and understand how it works, the bind service with perl imscp-autoinstall -dar named
The question is with no bind working, server reads all record of domain from which dns ? I just make some ping and all IP were right. This is just to know.

Thx for this help

just make some other test, I find the vi /etc/bind/named.conf.local
it contains all link for each domain on server like:

IF I open /var/cache/bind/xxxxxx.it.db there are all dns record:

it this the file I have to edit ?
I just edit it on test local server with 1.2.17 and I restart server. Edit are still there. So please only need to know if I can edit them or I will crash the server by myself
Just to know

last question then I go to sleep, IF I want to setup a different DNS to read the record direclty from autoritative dns, where I setup it , if it's possible ?

thx thx and thx again for suggestion and help
Umberto