Emails not delivered

[sebastienserre]

Hello,

For some days, I have had several emails not delivered.
In the logs, I can read:

{
    "ts": 1781015387801,
    "type": "deferred",
    "direction": "outbound",
    "uuid": "3118C384-EC0C-43D8-B705-41F57EEC074B.1",
    "messageId": null,
    "mailFrom": "<>",
    "spamStatus": null,
    "mailbox": null,
    "quotaPercent": null,
    "rcptTo": [
        "<communication@XXX.com>"
    ],
    "message": "Tried all MXs",
    "delay": 65536,
    "failRecips": null,
    "mx": null,
    "_id": "3118C384-EC0C-43D8-B705-41F57EEC074B.1-1781015387801",
    "isOpen": true
}

Any idea what is happening ?

Cloudron 9.20

[james]

Hello @sebastienserre
Please include the output of cloudron-support --troubleshoot

[sebastienserre]

root@my:~# cloudron-support --troubleshoot
Vendor: QEMU Product: Standard PC (i440FX + PIIX, 1996)
Linux: 6.8.0-124-generic
Ubuntu: noble 24.04
Cloudron: 9.2.0
Execution environment: kvm
Processor: AMD EPYC 9354P 32-Core Processor
BIOS pc-i440fx-10.1  CPU @ 2.0GHz x 2
RAM: 8131468KB
Disk: /dev/sda1        50G
[OK]	Root disk usage is OK (49%)
[OK]	Memory usage is OK (67%)
[OK]	Clock is NTP-synchronized
[OK]	node version is correct
[OK]	IPv6 is enabled in kernel. Public IPv6 address detected
[OK]	docker is running
[OK]	docker version is correct
[OK]	MySQL is running
[OK]	netplan is good
[OK]	DNS is resolving via systemd-resolved
[OK]	unbound is running
[OK]	IPv4 HTTPS to api.cloudron.io/api/v1/helper/public_ip
[OK]	IPv6 HTTPS to api.cloudron.io/api/v1/helper/public_ip
[OK]	IPv4 HTTPS to auth.docker.io/token
[OK]	IPv6 HTTPS to auth.docker.io/token
[OK]	IPv4 HTTPS to acme-v02.api.letsencrypt.org
[OK]	IPv6 HTTPS to acme-v02.api.letsencrypt.org
[OK]	nginx is running
[OK]	dashboard cert is valid
[OK]	dashboard is reachable via loopback
[OK]	No pending database migrations
[OK]	Service 'mysql' is running and healthy
[OK]	Service 'postgresql' is running and healthy
[WARN]	Service 'mongodb' is not running (may be lazy-stopped)
[OK]	Service 'mail' is running and healthy
[OK]	Service 'graphite' is running and healthy
[OK]	Service 'sftp' is running and healthy
[OK]	box v9.2.0 is running
[OK]	Dashboard is reachable via IPv4 (https://my.thivinfo.com)
[FAIL]	IPv6: could not load https://my.thivinfo.com
[OK]	Domain thivinfo.com is valid and has not expired

======== Summary ========
PASS:  29
WARN:  1
FAIL:  1
SKIP:  0

Failures:
  - IPv6: could not load https://my.thivinfo.com

Warnings:
  - Service 'mongodb' is not running (may be lazy-stopped)

For troubleshooting tips, see https://docs.cloudron.io/troubleshooting
To share a full diagnostic dump on the forum, run: cloudron-support --send-diagnostics
root@my:~# 

[jdaviescoates]

@sebastienserre said:

Any idea what is happening ?

likely your ipv6 issue I'd guess

[james]

Hello @sebastienserre
Yes, I would also assume the same as @jdaviescoates
No IPv6 for a mailserver is getting used a block reason these days.

[sebastienserre]

But one is set on the bunny DNS (created through the API directly by Cloudron)
https://mxtoolbox.com/SuperTool.aspx?action=aaaa%3Amy.thivinfo.com&run=toolpage

[jdaviescoates]

@sebastienserre it's probably the ipv6 reverse DNS aka rDNS aka PTR which you set via your VPS provider and not by your DNS provider