Unable to send via SMTP port 465 #124

New Issue

MrUnknownDE · 2026-04-05T20:31:02+02:00

MrUnknownDE commented

2026-04-05 20:31:02 +02:00

Originally created by @bilogic on 2/9/2026

Prerequisites

I have searched the existing Closed AND Open Issues AND Discussions
I have searched and read the documentation

Vaultwarden Support String

I have tried all 3 starttls, force_tls and off, all unable to send email via port 465.
The SMTP server in question is mail-in-a-box, which has reasonable defaults.

Vaultwarden Build Version

1.35.0

Deployment method

Official Container Image

Custom deployment method

No response

Reverse Proxy

no

Host/Server Operating System

Linux

Operating System Version

No response

Clients

Desktop, Web Vault

Client Version

No response

Steps To Reproduce

Go to SMTP setup page, see screenshot

Expected Result

Email should be sent successfully

Actual Result

Return a Chrome alert Error inviting user undefined Or SMTP 4xx error: transient error (451): 4.3.5 Server configuration error

Logs

Screenshots or Videos

No response

Additional Context

No response

*Originally created by @bilogic on 2/9/2026* ### Prerequisites - [x] I have searched the existing **Closed _AND_ Open** [Issues](https://github.com/dani-garcia/vaultwarden/issues?q=is%3Aissue%20) **_AND_** [Discussions](https://github.com/dani-garcia/vaultwarden/discussions?discussions_q=) - [x] I have searched and read the [documentation](https://github.com/dani-garcia/vaultwarden/wiki/) ### Vaultwarden Support String <img width="603" height="456" alt="Image" src="https://github.com/user-attachments/assets/59332eec-0c13-4f41-8b58-c579216377e2" /> I have tried all 3 `starttls`, `force_tls` and `off`, all unable to send email via port 465. The SMTP server in question is mail-in-a-box, which has reasonable defaults. ### Vaultwarden Build Version 1.35.0 ### Deployment method Official Container Image ### Custom deployment method _No response_ ### Reverse Proxy no ### Host/Server Operating System Linux ### Operating System Version _No response_ ### Clients Desktop, Web Vault ### Client Version _No response_ ### Steps To Reproduce Go to SMTP setup page, see screenshot ### Expected Result Email should be sent successfully ### Actual Result Return a Chrome alert `Error inviting user undefined` Or `SMTP 4xx error: transient error (451): 4.3.5 Server configuration error` ### Logs ```text ``` ### Screenshots or Videos _No response_ ### Additional Context _No response_

MrUnknownDE closed this issue

2026-04-05 20:31:02 +02:00

MrUnknownDE added the bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug labels 2026-04-05 20:31:07 +02:00

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Reference: github/vaultwarden#124