Mail works only internally

[someonesusername]

It’s no-where setup as nothing at all actually I just tried to send an e-mail to one of my other addresses on their server.

[wbk]

There’s still this line in the headers you posted:

Diagnostic-Code: smtp; 550 Bad HELO - Host impersonating domain name
[easycomp.cloud]

That’s not DNS, but configuration on your server.

Or… did you check your IP config?

$ ping easycomp.cloud
PING easycomp.cloud (212.92.85.88) 56(84) bytes of data.
64 bytes from easycomp.cloud (212.92.85.88): icmp_seq=1 ttl=57 time=18.5 ms
64 bytes from easycomp.cloud (212.92.85.88): icmp_seq=2 ttl=57 time=17.0 ms
^C
--- easycomp.cloud ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 17.018/17.766/18.515/0.760 ms
$ ping easycompzeeland.nl
PING easycompzeeland.nl(web8.hostingcp.eu (2a09:8b00:252:8::10)) 56 data bytes
64 bytes from web8.hostingcp.eu (2a09:8b00:252:8::10): icmp_seq=1 ttl=54 time=8.51 ms
^C
--- easycompzeeland.nl ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 8ms
rtt min/avg/max/mdev = 6.201/11.093/22.819/6.822 ms
$ ping6 easycomp.cloud
ping: easycomp.cloud: Name or service not known
$ 

Does the receiving end have IPv6 enabled? It seems IPv4 is available for your Yunohost (the other domains do reply), but the mail domain does not reply.

Did you give https://www.mail-tester.com/ a try?

[someonesusername]

Yes it did not work but (tester).

How is dat config getting wrong values, easycomp.cloud and easycomphost.nl are the domains for yuno. EasyCompZeeland.nl is a complete different independent server and it’s not even configured to do something together.

[someonesusername]

Anything on this topic?