[GH-ISSUE #4416] Sendmail client error #1878

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opened 2026-03-03 02:13:02 +03:00 by kerem · 1 comment

kerem commented

2026-03-03 02:13:02 +03:00

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Originally created by @shishkin on GitHub (Mar 8, 2024).
Original GitHub issue: https://github.com/dani-garcia/vaultwarden/issues/4416

Subject of the issue

I'm unable to get vaultwarden to send a test email using sendmail command.

Deployment environment

Versions

Server Installed
Server Latest
1.30.5
Web Installed
2023.10.0
Web Latest
2024.1.2b
Database
SQLite: 3.44.0

Checks

OS/Arch
linux / aarch64
Running within Docker
No
Environment settings overridden
Yes
Uses a reverse proxy
Yes
IP header Match
Config/Server: X-Real-IP
Internet access Ok
Yes
Internet access via a proxy
No
DNS (github.com)
20.201.28.151
Date & Time (Local)
Server: 2024-03-08 18:31:29 +01:00
Date & Time (UTC) Server/Browser Ok Server NTP Ok Browser NTP Ok
NTP: 2024-03-08 17:31:29 UTC Server: 2024-03-08 17:31:29 UTC Browser: 2024-03-08 17:31:29 UTC
Domain configuration Match HTTPS
Server: https://vault.example.org/admin/diagnostics Browser: https://vault.example.org/admin/diagnostics

Install method: vaultwarden service on NixOS
Other relevant details:

I have installed nullmailer service on NixOS and configured vaultwarden systemd unit according to https://github.com/dani-garcia/vaultwarden/wiki/SMTP-configuration#using-sendmail-without-docker. User vaultwarden added to nullmailer group.

Systemd unit generated by nixos:

[Unit]
After=network.target nullmailer.service

[Service]
Environment="LOCALE_ARCHIVE=/nix/store/njw85hk2qpsri7b0js2sl4ngn3pn4vbc-glibc-locales-2.38-44/lib/locale/locale-archive"
Environment="PATH=/nix/store/6cdz0jqlhzf1f9n7z4385qp1w2i07syk-openssl-3.0.13-bin/bin:/nix/store/b6zx4l1fckzxh2rvgdriv212ashc089c-nullmailer-2.2/bin:/nix/store/k6h0vjh342kqlkq69sxjj8i5y50l6jfr-coreutils-9.3/bin:/nix/store/1mlygd55wv1wb2a524aa72lgl8mi4346-findutils-4.9.0/bin:/nix/store/h0bg57s9kl87jh5175zjscaf70wmshra-gnugrep-3.11/bin:/nix/store/f41vw9g59504hkbmxhz04gbr1vl6bviy-gnused-4.9/bin:/nix/store/0jl30l5q1xf26pfh1pzyvm33gjpg5qwy-systemd-254.6/bin:/nix/store/6cdz0jqlhzf1f9n7z4385qp1w2i07syk-openssl-3.0.13-bin/sbin:/nix/store/b6zx4l1fckzxh2rvgdriv212ashc089c-nullmailer-2.2/sbin:/nix/store/k6h0vjh342kqlkq69sxjj8i5y50l6jfr-coreutils-9.3/sbin:/nix/store/1mlygd55wv1wb2a524aa72lgl8mi4346-findutils-4.9.0/sbin:/nix/store/h0bg57s9kl87jh5175zjscaf70wmshra-gnugrep-3.11/sbin:/nix/store/f41vw9g59504hkbmxhz04gbr1vl6bviy-gnused-4.9/sbin:/nix/store/0jl30l5q1xf26pfh1pzyvm33gjpg5qwy-systemd-254.6/sbin"
Environment="TZDIR=/nix/store/h61j4lsxw9jpzqbjassciqjkwh55w2ip-tzdata-2024a/share/zoneinfo"
AmbientCapabilities=CAP_NET_BIND_SERVICE
EnvironmentFile=/nix/store/1rk11vyfnd5rh0fg2x7sqy3525qwqji4-vaultwarden.env
EnvironmentFile=/var/lib/bitwarden_rs/secrets.env
ExecStart=/nix/store/f8b5r5dikrxlfvz1gz81jn01isd63fci-vaultwarden-1.30.1/bin/vaultwarden
Group=vaultwarden
LimitNOFILE=1048576
PrivateDevices=true
PrivateTmp=true
ProtectHome=true
ProtectSystem=strict
ReadWritePaths=/var/spool/nullmailer/queue/
Restart=always
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6 AF_LOCAL AF_NETLINK
StateDirectory=bitwarden_rs
StateDirectoryMode=0700
User=vaultwarden

Steps to reproduce

Go to admin page -> SMTP Email Settings -> Send test email

Expected behaviour

Expect email to be sent successfully.

Actual behaviour

Error sending SMTP test email
Sendmail client error: internal client error: nullmailer-inject: nullmailer-queue failed: 1

Troubleshooting data

I'm able to run echo "Subject: sendmail test" | sudo -u vaultwarden sendmail -v email@mydomain.org and get the email.
vaultwarden log has the same error message as in the admin page alert.

Any help troubleshooting the issue is very much appreciated.

Originally created by @shishkin on GitHub (Mar 8, 2024). Original GitHub issue: https://github.com/dani-garcia/vaultwarden/issues/4416 ### Subject of the issue I'm unable to get vaultwarden to send a test email using sendmail command. ### Deployment environment Versions Server Installed Server Latest 1.30.5 Web Installed 2023.10.0 Web Latest 2024.1.2b Database SQLite: 3.44.0 Checks OS/Arch linux / aarch64 Running within Docker No Environment settings overridden Yes Uses a reverse proxy Yes IP header Match Config/Server: X-Real-IP Internet access Ok Yes Internet access via a proxy No DNS (github.com) 20.201.28.151 Date & Time (Local) Server: 2024-03-08 18:31:29 +01:00 Date & Time (UTC) Server/Browser Ok Server NTP Ok Browser NTP Ok NTP: 2024-03-08 17:31:29 UTC Server: 2024-03-08 17:31:29 UTC Browser: 2024-03-08 17:31:29 UTC Domain configuration Match HTTPS Server: https://vault.example.org/admin/diagnostics Browser: https://vault.example.org/admin/diagnostics * Install method: vaultwarden service on NixOS * Other relevant details: I have installed nullmailer service on NixOS and configured vaultwarden systemd unit according to https://github.com/dani-garcia/vaultwarden/wiki/SMTP-configuration#using-sendmail-without-docker. User vaultwarden added to nullmailer group. Systemd unit generated by nixos: ``` [Unit] After=network.target nullmailer.service [Service] Environment="LOCALE_ARCHIVE=/nix/store/njw85hk2qpsri7b0js2sl4ngn3pn4vbc-glibc-locales-2.38-44/lib/locale/locale-archive" Environment="PATH=/nix/store/6cdz0jqlhzf1f9n7z4385qp1w2i07syk-openssl-3.0.13-bin/bin:/nix/store/b6zx4l1fckzxh2rvgdriv212ashc089c-nullmailer-2.2/bin:/nix/store/k6h0vjh342kqlkq69sxjj8i5y50l6jfr-coreutils-9.3/bin:/nix/store/1mlygd55wv1wb2a524aa72lgl8mi4346-findutils-4.9.0/bin:/nix/store/h0bg57s9kl87jh5175zjscaf70wmshra-gnugrep-3.11/bin:/nix/store/f41vw9g59504hkbmxhz04gbr1vl6bviy-gnused-4.9/bin:/nix/store/0jl30l5q1xf26pfh1pzyvm33gjpg5qwy-systemd-254.6/bin:/nix/store/6cdz0jqlhzf1f9n7z4385qp1w2i07syk-openssl-3.0.13-bin/sbin:/nix/store/b6zx4l1fckzxh2rvgdriv212ashc089c-nullmailer-2.2/sbin:/nix/store/k6h0vjh342kqlkq69sxjj8i5y50l6jfr-coreutils-9.3/sbin:/nix/store/1mlygd55wv1wb2a524aa72lgl8mi4346-findutils-4.9.0/sbin:/nix/store/h0bg57s9kl87jh5175zjscaf70wmshra-gnugrep-3.11/sbin:/nix/store/f41vw9g59504hkbmxhz04gbr1vl6bviy-gnused-4.9/sbin:/nix/store/0jl30l5q1xf26pfh1pzyvm33gjpg5qwy-systemd-254.6/sbin" Environment="TZDIR=/nix/store/h61j4lsxw9jpzqbjassciqjkwh55w2ip-tzdata-2024a/share/zoneinfo" AmbientCapabilities=CAP_NET_BIND_SERVICE EnvironmentFile=/nix/store/1rk11vyfnd5rh0fg2x7sqy3525qwqji4-vaultwarden.env EnvironmentFile=/var/lib/bitwarden_rs/secrets.env ExecStart=/nix/store/f8b5r5dikrxlfvz1gz81jn01isd63fci-vaultwarden-1.30.1/bin/vaultwarden Group=vaultwarden LimitNOFILE=1048576 PrivateDevices=true PrivateTmp=true ProtectHome=true ProtectSystem=strict ReadWritePaths=/var/spool/nullmailer/queue/ Restart=always RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6 AF_LOCAL AF_NETLINK StateDirectory=bitwarden_rs StateDirectoryMode=0700 User=vaultwarden ``` ### Steps to reproduce Go to admin page -> SMTP Email Settings -> Send test email ### Expected behaviour Expect email to be sent successfully. ### Actual behaviour ``` Error sending SMTP test email Sendmail client error: internal client error: nullmailer-inject: nullmailer-queue failed: 1 ``` ### Troubleshooting data I'm able to run `echo "Subject: sendmail test" | sudo -u vaultwarden sendmail -v email@mydomain.org` and get the email. vaultwarden log has the same error message as in the admin page alert. Any help troubleshooting the issue is very much appreciated.

kerem closed this issue

2026-03-03 02:13:02 +03:00

kerem commented

2026-03-03 02:13:03 +03:00

Author

Owner

@stefan0xC commented on GitHub (Mar 8, 2024):

ReadWritePaths=/var/spool/nullmailer/queue/

Are you sure that this is the only directory that needs to be writable? Can you try with /var/spool/nullmailer?

@stefan0xC commented on GitHub (Mar 8, 2024): > `ReadWritePaths=/var/spool/nullmailer/queue/` Are you sure that this is the only directory that needs to be writable? Can you try with `/var/spool/nullmailer`?

kerem referenced this issue

2026-03-03 09:25:28 +03:00

[PR #1921] [MERGED] Fix wrong display of MFA email. #3023