SMTP does not work...

[marcogaio]

I'm testing Claper (wondeful!) for a Linux User group here in north east of Italy (Pordenone Linux User Group, PNLug).

I was able to run the docker container, fix some issue putting it behind a nginx reverse proxy (if needed, i can provide feedback on that, because i've not found info on documents) but still Claper does not send email.

Docker VM is part of a little virtualization setup, where there's also an SMTP server/relay that send email for all the services. I've setup .env as:

SMTP_RELAY=10.21.13.180
SMTP_AUTH=never
SMTP_PORT=25
SMTP_TLS=never
SMTP_SSL=false

But email does not get sent; even, i've sniffed on network interfaces, end there's even NO SMTP traffic, so Claper seems never tries to send email...

Network and SMTP server reachability seems fine:

root@vdockerpnlug1:~# docker ps
CONTAINER ID   IMAGE                            COMMAND                  CREATED        STATUS                  PORTS                                       NAMES
ff6a3668b491   ghcr.io/claperco/claper:latest   "sh -c '/app/bin/cla…"   20 hours ago   Up 20 hours (healthy)   0.0.0.0:4000->4000/tcp, :::4000->4000/tcp   claper-app-1
dddc4a72e4f4   postgres:15                      "docker-entrypoint.s…"   20 hours ago   Up 20 hours (healthy)   0.0.0.0:5432->5432/tcp, :::5432->5432/tcp   claper-db-1
root@vdockerpnlug1:~# docker exec -it  ff6a3668b491 bash
ff6a3668b491:/app# nc 10.21.13.180 25
220 mail.artemis.pnlug.it ESMTP Exim 4.94.2 Mon, 14 Oct 2024 14:17:05 +0200
help
214-Commands supported:
214 AUTH STARTTLS HELO EHLO MAIL RCPT DATA BDAT NOOP QUIT RSET HELP
quit
221 mail.artemis.pnlug.it closing connection

What i'm doing wrong?! Thanks.

[alxlion]

Ciao Marco!

Claper doesn't send a lot of emails, it only sends an email when

• You request a password change
• Add a facilitator when you edit/create an event

Have you tried this to test your smtp configuration?

[marcogaio]

Sorry, forgot a piece; my complete email configuration in `.env ' is:

MAIL_TRANSPORT=smtp
MAIL_FROM=tech@pnlug.it
MAIL_FROM_NAME=Claper

SMTP_RELAY=10.21.13.180
SMTP_AUTH=never
SMTP_PORT=25
SMTP_TLS=never
SMTP_SSL=false

I've tried to:

1. change my password
2. change my email
3. reset my password

no email get sent...

[marcogaio]

Claper doesn't send a lot of emails, it only sends an email when

Sorry, forgot to say.

So there's no confirmation mechanism for user creation? This cannot lead to user creation bombing attacks?

[alxlion]

Email is always a pain to manage, so we try to avoid it at all costs. We use anti-bot and anti-spam on the frontend of our instance to avoid any bombing.

Regarding your issue, are you sure that the container has access to 10.21.13.180?

[marcogaio]

Email is always a pain to manage, so we try to avoid it at all costs. We use anti-bot and anti-spam on the frontend of our instance to avoid any bombing.

Ok... have some example configuration/hint/... to share? Thanks.

Regarding your issue, are you sure that the container has access to 10.21.13.180?

Sure! As you can see in my first post, i spawned a shell into the claper container and accessed the mail server.

[alxlion]

We just added EMAIL_CONFIRMATION to enable email confirmation at registration if you need so (https://docs.claper.co/self-hosting/configuration.html#email-confirmation) (available on the dev version).

Do you have any app logs in Claper to share?

[marcogaio]

We just added EMAIL_CONFIRMATION to enable email confirmation at registration if you need so (https://docs.claper.co/self-hosting/configuration.html#email-confirmation) (available on the dev version).

I've stopped, updated and restarted the container, setting that variable in .env; nothing changed...

Do you have any app logs in Claper to share?

Do you mean the log i can obtain with `docker logs --follow e9e6c0a6cc8b '? Seems me contain nothing more then HTTP GET and WebSocket request.

Particulary, there's no SMTP/email row...

[alxlion]

Sorry for the late reply, I am trying to reproduce this and investigate