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If anyone has similar issues. How i got around it was by adding a user to cloudron, and ask them to use the "Login with [cloudron instance name]".

Turns out to be a configuration issue of the email on the domain I am using. May be a good thing to mention in the postiz docs to double check those.

Still unsure what the expected behavior is now that the email goes out. It does not seem to add the user after they click the link. But that may be a postiz issue, not on cloudrons side.

Trying to add a team member in postiz says "invitation email sent"

The env file has EMAIL_PROVIDER="nodemailer" set.

However In the logs i see the following error:

Nov 12 10:53:25 172.18.0.1 - - [12/Nov/2025:17:53:25 +0000] "GET /api/settings/team HTTP/1.1" 200 137 "https://postiz.mydomain.co/settings" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36"
Nov 12 10:53:30 172.18.0.1 - - [12/Nov/2025:17:53:30 +0000] "GET / HTTP/1.1" 307 15 "-" "Mozilla (CloudronHealth)"
Nov 12 10:53:34 Error: Invalid login: 535 5.7.8 Authentication failed
Nov 12 10:53:34 at SMTPConnection._formatError (/app/code/node_modules/nodemailer/lib/smtp-connection/index.js:809:19)
Nov 12 10:53:34 at SMTPConnection._actionAUTHComplete (/app/code/node_modules/nodemailer/lib/smtp-connection/index.js:1588:34)
Nov 12 10:53:34 at SMTPConnection.<anonymous> (/app/code/node_modules/nodemailer/lib/smtp-connection/index.js:556:26)
Nov 12 10:53:34 at SMTPConnection._processResponse (/app/code/node_modules/nodemailer/lib/smtp-connection/index.js:993:20)
Nov 12 10:53:34 at SMTPConnection._onData (/app/code/node_modules/nodemailer/lib/smtp-connection/index.js:774:14)
Nov 12 10:53:34 at SMTPConnection._onSocketData (/app/code/node_modules/nodemailer/lib/smtp-connection/index.js:195:44)
Nov 12 10:53:34 at Socket.emit (node:events:519:28)
Nov 12 10:53:34 at addChunk (node:internal/streams/readable:561:12)
Nov 12 10:53:34 at readableAddChunkPushByteMode (node:internal/streams/readable:512:3)
Nov 12 10:53:34 at Readable.push (node:internal/streams/readable:392:5)
Nov 12 10:53:34 at TCP.onStreamRead (node:internal/stream_base_commons:189:23) {
Nov 12 10:53:34 code: 'EAUTH',
Nov 12 10:53:34 response: '535 5.7.8 Authentication failed',
Nov 12 10:53:34 responseCode: 535,
Nov 12 10:53:34 command: 'AUTH PLAIN'
Nov 12 10:53:34 }
Nov 12 10:53:34 172.18.0.1 - - [12/Nov/2025:17:53:34 +0000] "POST /api/settings/team HTTP/1.1" 201 347 "https://postiz.mydomain.co/settings" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36"
Nov 12 10:53:40 172.18.0.1 - - [12/Nov/2025:17:53:40 +0000] "GET / HTTP/1.1" 307 15 "-" "Mozilla (CloudronHealth)"

Are there any other configurations we have to take to make this work?

I am familiar with the env file. I was just confused about the mention of the .sh file. Which i don't think is intended to be edited by us?

Thanks for the clarification.

Update:
I restarted the app again, and now it worked. I don't know what may have been the issue, but something seems to have a mind of it's own.

@nebulon How does one edit that file? I assume you speak about the start.sh?

As a side note. I think the info from this post should be added to the docs as well:
https://forum.cloudron.io/topic/13483/postiz-won-t-log-in-not-activated/2

I just uninstalled the postiz app, reinstalled it. Added the key and secret to /app/data/env and restarted.

Still getting the exact same behavior as before.

Any ideas how to troubleshoot this?

Because thats what the dicsord conversation said (i realize they don't use cloudron).

The issue is that i cannot add the x channel. The UI does not give any helpful errors other than a "could not connect to the platform" popup for 2sec.

When i look at the network tab, i get the above mentioned request made to
https://postiz.mydomain.com/api/integrations/social/x

with response: {"err":true}

thats how i got to suspect that the /api is the issue.

If i am however on the wrong track. then let me know what else i could try.

that said. If I can't overwrite the env file, then the docs are wrong i guess? (https://docs.cloudron.io/packages/postiz/#customization), and how am I going to add the API keys for the providers?

I am at my wits end. Installed, updated the env file for X (setup x app as well).

But its not working. From what i can tell it looks like the env vars are not taking effect.

E.g. i still have /api/ in the NEXT_PUBLIC_BACKEND_URL as set in the start.sh

NEXT_PUBLIC_BACKEND_URL="${CLOUDRON_APP_ORIGIN}/api"

I overwrote them in my env file

MAIN_URL="https://postiz.mydomain.com"
FRONTEND_URL="https://postiz.mydomain.com"
NEXT_PUBLIC_BACKEND_URL="https://postiz.mydomain.com"

But in the network tab, i see it trying to hit /api in the Request URL

Also, based on this discord chat on postiz I assume the /api is outdated?
https://discord.com/channels/1243410146097500202/1413958563579297892/1413958563579297892

Just to clarify. Yes i did restart the cloudron app after editing the env file.

Confirmed, rolled back version seems to work

@girish yes, was a fresh install. I will try the rolled back version now.

@robi my postgres is running and nowhere near the limits in services. Is there anything special for the cal.com app that I am missing? There were no instructions on the app page, so I expected it should just work once the app is installed.

@nebulon, would love your advice on this.

I installed and setup, and getting 404 on the public page and all event pages. Can't find any errors other that a ton of these in the logs:

Nov 20 12:26:02@calcom/web:start: error connecting to engine: sql, type: postgres db: Error: connect ECONNREFUSED ::1:5432

What am I missing?