### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 20, 2026, 10:59pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/1 "2026-01-20T22:59:23Z")
**What app is this about, and its version** : 1.35.2~ynh1
**What YunoHost version are you running** : 12.1.39
**What type of hardware are you using** : VPS bought online
### Describe your issue
Hi everyone,
I’m facing a very persistent Postfix issue on a YunoHost server and I’m running out of ideas.
I’d really appreciate any insight from people familiar with YunoHost’s mail stack.
### Share relevant logs or error messages
> **[hastebin](https://paste.yunohost.org/awupuqoqol)**
The settings and error on Vaultwarden admin page:
[ ](https://i.hizliresim.com/4p0dkqv.png)
---
### Author:  [@Sloknatos](https://forum.yunohost.org/u/Sloknatos)
#### Post date: [January 21, 2026, 9:14am UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/2 "2026-01-21T09:14:56Z")
hello,
maybe you’ve already check it but, just in case, in your yunohost users panel, have you an user “vaultwarden” / [the\_password] ?
i’m not familiar with [nohost.me](http://nohost.me), not sure about the needed configuration
myself, i have this in the vaultwarden admin panel :
and this in yunohost :
(of course, i obfuscate the subdomain / domain / tld, imagine something as `vaultpass.mydomain.com`)
---
### Author:  [@orhtej2](https://forum.yunohost.org/u/orhtej2)
#### Post date: [January 21, 2026, 9:15am UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/3 "2026-01-21T09:15:05Z")
Can you try changing the configuration as following:
Host: 127.0.0.1
Port: 587
Server name sent during HELO: \
Accept Invalid certs: true
To my knowledge service users (such as `vaultwarden` are only allowed to connect to `localhost`.
---
### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 21, 2026, 12:22pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/4 "2026-01-21T12:22:18Z")
Actually, I tried to open a new user on YunoHost panel but it says: “User already exists”. Also when I tried with my information on Vaultwarden admin I got the same error.
And I also made some attemps with your directions. I tried with just [atakan.nohost.me](http://atakan.nohost.me) (w/o application name before [atakan.nohost.me](http://atakan.nohost.me)) but, still getting same error.
---
### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 21, 2026, 12:26pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/5 "2026-01-21T12:26:34Z")
[ ](https://i.hizliresim.com/2chomby.png)
When I installed Vaultwarden first, I can use it iwthout any extra configurations, error etc.
Without the Zen Browser’s error:
[ ](https://i.hizliresim.com/dybj6mu.png)
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### Author:  [@Interleukin4](https://forum.yunohost.org/u/Interleukin4)
#### Post date: [January 22, 2026, 4:11pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/6 "2026-01-22T16:11:39Z")
I appreciate that this is unhelpful, but I ended up just using an external SMTP relay as I was unable to solve this myself using the built in SMTP. I had the same error (535) with a different application but an identical configuration
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### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 22, 2026, 6:39pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/7 "2026-01-22T18:39:14Z")
Actually, I was previously using YunoHost’s built-in SMTP relay with the default configuration without any issues.
I’m not sure what changed, but this problem started recently and now occurs even when no application is actively sending emails.
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### Author:  [@Interleukin4](https://forum.yunohost.org/u/Interleukin4)
#### Post date: [January 22, 2026, 9:10pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/8 "2026-01-22T21:10:06Z")
Ah, I’m very new to Yunohost in the last few days and haven’t experienced the built in SMTP working - I assumed it just didn’t work or required some configuration I hadn’t come across. Perhaps this is a recent change that has broken something
---
### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 22, 2026, 9:33pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/9 "2026-01-22T21:33:03Z")
Yeah, maybe. I lost Vaultwarden’s master password. Then I tried to recover it but I couldn’t succeed. Then, I uninstalled it. After re-installation I got this error.
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### Author:  [@orhtej2](https://forum.yunohost.org/u/orhtej2)
#### Post date: [January 24, 2026, 11:02pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/10 "2026-01-24T23:02:04Z")
My installation properly sends emails (I was wrong about needing to change anything).
Perhaps something breaks during reinstall loop?
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### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 25, 2026, 12:55pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/11 "2026-01-25T12:55:12Z")
Well, I need to check installation logs. However, I don’t know is there an option to see them.
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### Author:  [@orhtej2](https://forum.yunohost.org/u/orhtej2)
#### Post date: [January 25, 2026, 1:09pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/12 "2026-01-25T13:09:43Z")
They should be under WebAdmin-\>Tools-\>Logs, installation of app should have logs for suboperation (provision system user in this case) linked.
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### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 25, 2026, 2:38pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/13 "2026-01-25T14:38:23Z")
Here all they for re-installation:
[https://paste.yunohost.org/raw/pafuroreco](https://paste.yunohost.org/raw/pafuroreco)
[https://paste.yunohost.org/raw/moqaxexaxo](https://paste.yunohost.org/raw/moqaxexaxo)
Also there are some logs when I’m trying to upgrade:
[https://paste.yunohost.org/raw/vuxoharija](https://paste.yunohost.org/raw/vuxoharija)
[https://paste.yunohost.org/raw/tavewanaxa](https://paste.yunohost.org/raw/tavewanaxa)
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### Author:  [@orhtej2](https://forum.yunohost.org/u/orhtej2)
#### Post date: [January 26, 2026, 12:04pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/14 "2026-01-26T12:04:24Z")
Does the file `/etc/postfix/app_senders_login_maps` exist on your system? Who owns it?
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### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 26, 2026, 7:23pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/15 "2026-01-26T19:23:17Z")
Yeah, it exists. Inside of it there are e-mails of applications. Vaultwarden’s is: [vaultwarden@passwords.atakan.nohost.me](mailto:vaultwarden@passwords.atakan.nohost.me) vaultwarden
---
### Author:  [@orhtej2](https://forum.yunohost.org/u/orhtej2)
#### Post date: [January 26, 2026, 9:47pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/16 "2026-01-26T21:47:06Z")
and what happens if you `sudo postmap /etc/postfix/app_senders_login_maps` ?
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### Author:  [@jarod5001](https://forum.yunohost.org/u/jarod5001)
#### Post date: [January 26, 2026, 10:18pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/17 "2026-01-26T22:18:15Z")
What is the output of :
`sudo yunohost tools regen-conf --dry-run --with-diff `
This won’t change anything in the system. It only checks for inconsistencies.
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### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 26, 2026, 10:31pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/18 "2026-01-26T22:31:19Z")
Nothing.
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### Author:  [@atakanozban](https://forum.yunohost.org/u/atakanozban)
#### Post date: [January 26, 2026, 10:32pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/19 "2026-01-26T22:32:26Z")
Error: No regen-conf categories named ‘dry-run, --with-diff’
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### Author:  [@orhtej2](https://forum.yunohost.org/u/orhtej2)
#### Post date: [January 26, 2026, 10:34pm UTC](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360/20 "2026-01-26T22:34:22Z")
There’s no space between `--` and `dry-run`, it’s a command line switch.
[Next page](https://forum.yunohost.org/t/vaultwarden-cannot-send-emails/41360.md?page=2)