[Vaultwarden] SMTP issues

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1

What app is this about, and its version: Vaultwarden, 1.37.0~ynh1
What YunoHost version are you running: 12.1.40.1
What type of hardware are you using: VPS bought online

Describe your issue

Vaultwarden displays information about SMTP issues when I try to add someone to an org and it tries to send an email. The SMTP section of the .env file:

#SMTP_HOST=apps.kavela.ch
SMTP_HOST=127.0.0.1
SMTP_FROM=vaultwarden@apps.kavela.ch
SMTP_FROM_NAME=Vaultwarden
SMTP_USERNAME=vaultwarden
SMTP_PASSWORD=redacted

as you can see above the host was different, but I tried to use the tip from here, to no avail :confused:

Share relevant logs or error messages

/var/log/vaultwarden/vaultwarden.log shows:

[2026-07-28 22:27:36.051][vaultwarden::mail][ERROR] SMTP 5xx error: permanent error (535): 5.7.8 Error: authentication failed: (reason unavailable) - Authentication credentials invalid
[2026-07-28 22:27:36.051][vaultwarden::mail][ERROR] SMTP 5xx error: permanent error (535): 5.7.8 Error: authentication failed: (reason unavailable) - Authentication credentials invalid
[2026-07-28 22:27:36.054][vaultwarden::api::core::organizations][ERROR] Error sending invite: SMTP 5xx error: permanent error (535): 5.7.8 Error: authentication failed: (reason unavailable) - Authentication credentials invalid
[2026-07-28 22:27:36.054][vaultwarden::api::core::organizations][ERROR] Error sending invite: SMTP 5xx error: permanent error (535): 5.7.8 Error: authentication failed: (reason unavailable) - Authentication credentials invalid
2
3

why have you changed SMTP_HOST? I think domain name was OK here.

To add some context apps are given SMTP credentials only valid if the authentication attempts comes from some realm and I think host name where the app is installed is the right one.

4

@JfmbLinux hello, thanks for your post, but could you point to the specific part of these that might help me? I use the default yunohost configuration (well, besides the SMTP_HOST change), I don’t use any of the big providers.

@orhtej2 I tried to follow the tip from this thread but it didn’t work :confused: I went back to the default configuration but it did not fix the issue (the domain matches the one that vaultwarden runs on).

5

Try changing SMTP_PORT to 587
But you have to reset the host to the domain of vaultwarden.

Did you change the password? If not, does it contain special characters?

6

Changing the port did not help :confused: I did not change the password and it does only contain letters and numbers.

7

Is it the same error message?

Try setting smtp host as the default domain of your server