Panic if temporary SMTP-Problem #1148

New Issue

MrUnknownDE · 2026-04-06T01:39:54+02:00

MrUnknownDE commented

2026-04-06 01:39:54 +02:00

Originally created by @Subito on 4/29/2024

Subject of the issue

Sometimes on trying to send a 2FA-Mail, the SMTP Server replies with 454: 4.7.0 Temporary authentication failure, which should indicate to the sender "please try later, this is a temporary problem". However vaultwarden panics if it receives this error and the server stops.

Deployment environment

vaultwarden version: 1.30.3

Install method: FreeBSD pkg
Clients used: happens on all clients on Login
Reverse proxy and version: nginx
Other relevant details:

Expected behaviour

Server does not crash if it receives a temporary SMTP-Failure.

Actual behaviour

Server crashes and needs restarting.

Troubleshooting data

Apr 29 16:13:58 vault1 vaultwarden[66287]: [2024-04-29 16:13:58.251][vaultwarden::mail][ERROR] SMTP 4xx error: transient error (454): 4.7.0 Temporary authentication failure: Connection lost to authentication server
Apr 29 16:13:58 vault1 vaultwarden[66287]: [2024-04-29 16:13:58.252][panic][ERROR] thread 'tokio-runtime-worker' panicked at 'Error sending incomplete 2FA email: SMTP 4xx error: transient error (454): 4.7.0 Temporary authentication failure: Connection lost to authentication server': src/api/core/two_factor/mod.rs:273

*Originally created by @Subito on 4/29/2024*   ### Subject of the issue  Sometimes on trying to send a 2FA-Mail, the SMTP Server replies with `454: 4.7.0 Temporary authentication failure`, which should indicate to the sender "please try later, this is a temporary problem". However vaultwarden panics if it receives this error and the server stops. ### Deployment environment     * vaultwarden version: 1.30.3  * Install method: FreeBSD pkg * Clients used: happens on all clients on Login  * Reverse proxy and version: nginx  * Other relevant details: ### Expected behaviour  Server does not crash if it receives a temporary SMTP-Failure. ### Actual behaviour  Server crashes and needs restarting. ### Troubleshooting data ``` Apr 29 16:13:58 vault1 vaultwarden[66287]: [2024-04-29 16:13:58.251][vaultwarden::mail][ERROR] SMTP 4xx error: transient error (454): 4.7.0 Temporary authentication failure: Connection lost to authentication server Apr 29 16:13:58 vault1 vaultwarden[66287]: [2024-04-29 16:13:58.252][panic][ERROR] thread 'tokio-runtime-worker' panicked at 'Error sending incomplete 2FA email: SMTP 4xx error: transient error (454): 4.7.0 Temporary authentication failure: Connection lost to authentication server': src/api/core/two_factor/mod.rs:273 ```

MrUnknownDE closed this issue

2026-04-06 01:39:54 +02:00

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Reference: github/vaultwarden#1148