Mails bounce or disappear. Suddenly can't receive mails anymore (was working before)

Support
,
1

What type of hardware are you using: VPS bought online
What YunoHost version are you running: 12.1.17.1
How are you able to access your server: The webadmin
SSH

Describe your issue

Mail was working properly.
After a recent upgrade, mails started to bounce. “status=bounced (mail for XXX loops back to myself yunohost)”
Mails seem to go through rspamd wihtough being blocked, but they don’t arrive in the mail box.
It was all working a couple days ago.

Share relevant logs or error messages

I don’t know what logs are of interest, but I can share any log that is pointed

2

The diagnosis and yunohost tools regen-conf --dry-run --with-diff

3

Success! The configuration would have been updated for category ‘dnsmasq’
dnsmasq:
applied:
/etc/resolv.dnsmasq.conf:
diff: @@ -1,14 +1,14 @@
+nameserver 2001:1608:10:25::1c04:b12f
+nameserver 2001:678:8::3
+nameserver 2001:1608:10:25::9249:d69b
+nameserver 185.233.100.100
+nameserver 84.200.70.40
+nameserver 2a0c:e300::1337
+nameserver 185.233.100.101
+nameserver 45.67.81.23
nameserver 2a0c:e300::101
-nameserver 2001:678:8::3
-nameserver 194.0.5.3
-nameserver 185.233.100.101
nameserver 2a0c:e300::100
-nameserver 2001:1608:10:25::9249:d69b
nameserver 89.234.141.66
-nameserver 185.233.100.100
nameserver 194.150.168.168
nameserver 2a00:5881:8100:1000::3
-nameserver 45.67.81.23
-nameserver 84.200.70.40
-nameserver 2a0c:e300::1337
-nameserver 2001:1608:10:25::1c04:b12f
+nameserver 194.0.5.3
status: updated
pending:

4

Do you have ports 53 or 5353 open?

5

It wasn’t open… which is weird because it was working before.
I opened 53 and 5353 (ingress only, should I do egress too?)

Tried to send an email from outside to my mailbox and it bounced.
Remote Server returned ‘554 5.4.6 < #5.4.6 X-Postfix; mail for xx.xx.net loops back to myself>’

6

I didn’t tell you to open them. They should be closed

7

Let regen the dnsmasq config with yunohost tools regen-conf --force, then check /etc/hosts for anything abnormal :

cat /etc/hosts
127.0.0.1       localhost
::1     localhost       ip6-localhost   ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

127.0.1.1       domain.com        domain

127.0.0.1       domain
8

It says that my system has configured “manage_etc_hosts” as true.

from what I see, it’s more in the form of

127.0.1.1       domain.com        domain.com
127.0.0.1       domain.com        domain.com