SMTP errror, no encryption: internal client error: No compatible authentication mechanism was found #1315

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OVERLORD · 2026-02-05T00:36:28+03:00

OVERLORD commented

2026-02-05 00:36:28 +03:00

Originally created by @deraljoscha on GitHub (Jul 8, 2022).

So I have the latest version of vaultwarden running on two servers. On one intance everythiung is running fine with SMTP over port 587 and starttls, on the other one I want to use a SMTP server which works with no encryption over port 25
my config looks like this:
SMTP_HOST=smtp.example.com
SMTP_FROM=mail@example.com
SMTP_FROM_NAME=Vaultwarden
SMTP_PORT=25
SMTP_SECURITY=off
SMTP_USERNAME=myusername
SMTP_PASSWORD=mypassword

I tried every option I could fin in the .env template
https://github.com/dani-garcia/vaultwarden/blob/main/.env.template

But I keep getting this error:

[vaultwarden::mail][ERROR] SMTP Client error: internal client error: No compatible authentication mechanism was found
[response][INFO] (reinvite_user) POST /api/organizations/<org_id>/users/<user_org>/reinvite => 400 Bad Request

I know my smtp genrally config works, I have it set up with the same options in other docker apps like uptime-kuma for example

would be grateful for some help
thanks in advance

Originally created by @deraljoscha on GitHub (Jul 8, 2022). So I have the latest version of vaultwarden running on two servers. On one intance everythiung is running fine with SMTP over port 587 and starttls, on the other one I want to use a SMTP server which works with no encryption over port 25 my config looks like this: SMTP_HOST=smtp.example.com SMTP_FROM=mail@example.com SMTP_FROM_NAME=Vaultwarden SMTP_PORT=25 SMTP_SECURITY=off SMTP_USERNAME=myusername SMTP_PASSWORD=mypassword I tried every option I could fin in the .env template https://github.com/dani-garcia/vaultwarden/blob/main/.env.template But I keep getting this error: [vaultwarden::mail][ERROR] SMTP Client error: internal client error: No compatible authentication mechanism was found [response][INFO] (reinvite_user) POST /api/organizations/<org_id>/users/<user_org>/reinvite => 400 Bad Request I know my smtp genrally config works, I have it set up with the same options in other docker apps like uptime-kuma for example would be grateful for some help thanks in advance

OVERLORD closed this issue

2026-02-05 00:36:31 +03:00

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Reference: starred/vaultwarden#1315