I’ve been debugging the mail sending server for Discourse, but I’ve run into an issue and was hoping I could get some help from you all!
DISCOURSE DOCTOR Tue Feb 3 12:57:50 PM CST 2026
OS: Linux instance-CvKJK0U4 6.12.38+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.38-1 (2025-07-16) x86_64 GNU/Linux
Found containers/app.yml
==================== YML SETTINGS ====================
DISCOURSE_HOSTNAME=metatest.smtc2web.org
SMTP_ADDRESS=smtp.resend.com
DEVELOPER_EMAILS=akarinliu@outlook.com
SMTP_PASSWORD=Mt$ygA$@yMhnF9#$
SMTP_PORT=465
SMTP_USER_NAME=noreply@akarinliu.com
==================== DOCKER INFO ====================
DOCKER VERSION: Docker version 29.2.1, build a5c7197
DOCKER PROCESSES (docker ps -a)
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3e1f56e5922e local_discourse/app “/sbin/boot” 43 seconds ago Up 43 seconds 0.0.0.0:8080->80/tcp, [::]:8080->80/tcp, 0.0.0.0:8443->443/tcp, [::]:8443->443/tcp app
467515024af6 1panel/openresty:1.27.1.2-5-1-focal “/usr/local/openrest…” 3 hours ago Up 3 hours 1Panel-openresty-0VRP
3e1f56e5922e local_discourse/app “/sbin/boot” 43 seconds ago Up 43 seconds 0.0.0.0:8080->80/tcp, [::]:8080->80/tcp, 0.0.0.0:8443->443/tcp, [::]:8443->443/tcp app
Discourse container app is running
==================== PLUGINS ====================
- git clone https://github.com/discourse/docker_manager.git
No non-official plugins detected.
See https://github.com/discourse/discourse/blob/main/lib/plugin/metadata.rb for the official list.
========================================
Discourse version at metatest.smtc2web.org: NOT FOUND
Discourse version at localhost: NOT FOUND
==================== MEMORY INFORMATION ====================
RAM (MB): 2069
total used free shared buff/cache available
Mem: 1973 1480 217 33 493 492
Swap: 2047 291 1756
==================== DISK SPACE CHECK ====================
---------- OS Disk Space ----------
df: /var/discourse: No such file or directory
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 30G 11G 18G 37% /
==================== DISK INFORMATION ====================
Disk /dev/sda: 30 GiB, 32212254720 bytes, 62914560 sectors
Disk model: QEMU HARDDISK
Units: sectors of 1 \* 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x86a4d272
Device Boot Start End Sectors Size Id Type
/dev/sda1 \* 2048 62914526 62912479 30G 83 Linux
==================== END DISK INFORMATION ====================
==================== MAIL TEST ====================
For a robust test, get an address from http://www.mail-tester.com/
Or just send a test message to yourself.
Email address for mail test? (‘n’ to skip) [akarinliu@outlook.com]:
Sending mail to akarinliu@outlook.com. . .
Testing sending to akarinliu@outlook.com using smtp.resend.com:465, username:noreply@akarinliu.com with plain auth.
==================================== ERROR =====================================
UNKNOWN ERROR!
Net::ReadTimeout: Net::ReadTimeout with #<TCPSocket:(closed)>
=================================== SOLUTION ===================================
This is not a common error. No recommended solution exists!
# Please report the exact error message above to https://meta.discourse.org/
(And a solution, if you find one!)
Replacing: SMTP_PASSWORD
Replacing: LETSENCRYPT_ACCOUNT_EMAIL
Replacing: DEVELOPER_EMAILS
Replacing: DISCOURSE_DB_PASSWORD
Replacing: Sending mail to
==================== DONE! ====================
Would you like to serve a publicly available version of this file? (Y/n) n
Publicly available log not generated.
You can examine the output of this script with
LESS=-Ri less /tmp/discourse-debug.txt
BUT FIRST, make sure that you know the first three commands below!!!
Commands to know when viewing the file with the above command (called ‘less’):
q – quit
/error – search for the word ‘error’
n – search for the next occurrence
g – go to the beginning of the file
f – go forward a page
b – go back a page
G – go to the end of the file