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Still having problems with DNS zonefile not propagating, very frustrasting

Hi all, I still got my problem!  I've got a GoDaddy domain, I'm using GoDaddy's own DNS servers.  I want to use email hosting from a different company, Mailbox.org.  So, I need to set up the DNS zonefile for my GoDaddy domain to forward emails to Mailbox.org, I've followed the instructions on Mailbox.org's website and done them in my domain control panel, but it doesn't seem to be working.  I used domain zone checkers for example MX Toolbox, Network Tools, etc., they all show no MX records or any entries I've made, the DNS nameservers are correct, and the DNS tools all download from the correct nameservers, and the serial numbers clearly show the zonefiles has been updated.  It looks like the changes I've put in the DNS zonefile isn't being used.  I believe I've enabled the domain, so what do I need to do to make it work?  I've called GoDaddy customer support a couple of times, but they were absolutely no help, one guy asked me which email client I was using repeatedly, even though it's completely irrelevant!

 

Here are the changes I've made to the zonefile in my GoDaddy account - I click on "Manage Domain", the three dots to the right of my domain, "Manage DNS", and have put in the following fields:

 

mxmy.domainmxext1.mailbox.org (Priority: 10)1 HourEdit
mxmy.domainmxext2.mailbox.org (Priority: 20)1 HourEdit
mxmy.domainmxext3.mailbox.org (Priority: 30)1 HourEdit

 

But when I use a number of DNS zonefile checkers, they all say my domain has no MX records, despite the serial number updating correctly - I've highlighted the relevant text in red - 2019062004 is the serial number and shows that it is downloading the most recent zonefile.  The DNS servers are GoDaddy's own servers.

my.domain results:

ns14.domaincontrol.com.A 2 ms
INxxx.xxx.xxx.xxx600
TXT 2 ms
No record found
LOC 3 ms
No record found
SOA 2 ms
INns13.domaincontrol.com. dns.jomax.net. 2019062004 28800 7200 604800 6003600
NS
INns14.domaincontrol.com.3600
INns13.domaincontrol.com.3600
SRV 2 ms
No record found
SPF 3 ms
No record found
CNAME 2 ms
No record found
MX 2 ms
No record found
AAAA 2 ms
No record found
ns13.domaincontrol.com.A 13 ms
INxxx.xxx.xxx.xxx600
TXT 2 ms
No record found
LOC 2 ms
No record found
SOA 2 ms
INns13.domaincontrol.com. dns.jomax.net. 2019062004 28800 7200 604800 6003600
NS
INns14.domaincontrol.com.3600
INns13.domaincontrol.com.3600
SRV 2 ms
No record found
SPF 2 ms
No record found
CNAME 3 ms
No record found
MX 2 ms
No record found
AAAA 2 ms
No record found

 

I've brought this domain nearly 2 months ago and still am unable to use it, I'm getting extremely frustrated with this.  Any advice would be massively appreciated!

 

Many thanks!