<![CDATA[Emails not delivered]]>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

]]>https://forum.cloudron.io/topic/15601/emails-not-deliveredRSS for NodeTue, 09 Jun 2026 20:13:40 GMTTue, 09 Jun 2026 15:01:36 GMT60<![CDATA[Reply to Emails not delivered on Tue, 09 Jun 2026 16:29:45 GMT]]>@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

]]>https://forum.cloudron.io/post/125638https://forum.cloudron.io/post/125638Tue, 09 Jun 2026 16:29:45 GMT<![CDATA[Reply to Emails not delivered on Tue, 09 Jun 2026 16:21:01 GMT]]>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

]]>https://forum.cloudron.io/post/125637https://forum.cloudron.io/post/125637Tue, 09 Jun 2026 16:21:01 GMT<![CDATA[Reply to Emails not delivered on Tue, 09 Jun 2026 15:44:44 GMT]]>Hello @sebastienserre
Yes, I would also assume the same as @jdaviescoates
No IPv6 for a mailserver is getting used a block reason these days.

]]>https://forum.cloudron.io/post/125636https://forum.cloudron.io/post/125636Tue, 09 Jun 2026 15:44:44 GMT<![CDATA[Reply to Emails not delivered on Tue, 09 Jun 2026 15:12:46 GMT]]>

@sebastienserre said:

Any idea what is happening ?

likely your ipv6 issue I'd guess

]]>https://forum.cloudron.io/post/125635https://forum.cloudron.io/post/125635Tue, 09 Jun 2026 15:12:46 GMT<![CDATA[Reply to Emails not delivered on Tue, 09 Jun 2026 15:11:34 GMT]]>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:~# ]]>https://forum.cloudron.io/post/125633https://forum.cloudron.io/post/125633Tue, 09 Jun 2026 15:11:34 GMT<![CDATA[Reply to Emails not delivered on Tue, 09 Jun 2026 15:06:19 GMT]]>Hello @sebastienserre
Please include the output of cloudron-support --troubleshoot

]]>https://forum.cloudron.io/post/125631https://forum.cloudron.io/post/125631Tue, 09 Jun 2026 15:06:19 GMT