Postal services are up but can't access it through web

[nithinkumarmav]

Postal seems to have installed correctly and is up and running:

postal status

NAME IMAGE COMMAND SERVICE CREATED STATUS PORTS
postal-smtp-1 ghcr.io/postalserver/postal:3.3.4 "/docker-entrypoint.…" smtp 21 minutes ago Up 17 minutes
postal-web-1 ghcr.io/postalserver/postal:3.3.4 "/docker-entrypoint.…" web 21 minutes ago Up 17 minutes
postal-worker-1 ghcr.io/postalserver/postal:3.3.4 "/docker-entrypoint.…" worker 21 minutes ago Up 17 minutes

ufw is also set to allow incoming traffic to port 5000

ufw status
Status: active

To Action From

---

5000 ALLOW Anywhere
80/tcp ALLOW Anywhere
443/tcp ALLOW Anywhere
25/tcp ALLOW Anywhere
2525/tcp ALLOW Anywhere
587/tcp ALLOW Anywhere
25,80,443,587,993/tcp ALLOW Anywhere
OpenSSH ALLOW Anywhere
5000 (v6) ALLOW Anywhere (v6)
80/tcp (v6) ALLOW Anywhere (v6)
443/tcp (v6) ALLOW Anywhere (v6)
25/tcp (v6) ALLOW Anywhere (v6)
2525/tcp (v6) ALLOW Anywhere (v6)
587/tcp (v6) ALLOW Anywhere (v6)
25,80,443,587,993/tcp (v6) ALLOW Anywhere (v6)
OpenSSH (v6) ALLOW Anywhere (v6)

seems to be actually listening port 5000,but can't access it through web. here's the netstat output:

netstat -tulnp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:5000 0.0.0.0:* LISTEN 9901/puma 6.4.2 (tc
tcp 0 0 127.0.0.54:53 0.0.0.0:* LISTEN 459/systemd-resolve
tcp 0 0 127.0.0.1:9090 0.0.0.0:* LISTEN 9884/ruby
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 459/systemd-resolve
tcp 0 0 127.0.0.1:9091 0.0.0.0:* LISTEN 9900/ruby
tcp 0 0 127.0.0.1:2019 0.0.0.0:* LISTEN 4515/caddy
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1/init
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 3570/docker-proxy
tcp6 0 0 :::443 :::* LISTEN 4515/caddy
tcp6 0 0 :::25 :::* LISTEN 9900/ruby
tcp6 0 0 :::22 :::* LISTEN 1/init
tcp6 0 0 :::80 :::* LISTEN 4515/caddy
udp 0 0 127.0.0.54:53 0.0.0.0:* 459/systemd-resolve
udp 0 0 127.0.0.53:53 0.0.0.0:* 459/systemd-resolve
udp6 0 0 :::443 :::* 4515/caddy
Here's the docker situation:

docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5be4abab2f36 ghcr.io/postalserver/postal:3.3.4 "/docker-entrypoint.…" 32 minutes ago Up 28 minutes postal-smtp-1
b9b88f393cc1 ghcr.io/postalserver/postal:3.3.4 "/docker-entrypoint.…" 32 minutes ago Up 28 minutes postal-worker-1
bd50559d7d7e ghcr.io/postalserver/postal:3.3.4 "/docker-entrypoint.…" 32 minutes ago Up 28 minutes postal-web-1
045a210f5667 caddy "caddy run --config …" 2 hours ago Up 2 hours postal-caddy
c6e5606568bd mariadb "docker-entrypoint.s…" 2 hours ago Up 2 hours 127.0.0.1:3306->3306/tcp postal-mariadb

It is showing the html when i command curl -v http://mysubdomain.mydomain.com:5000

User-Agent: curl/8.9.1
Accept: /

• Request completely sent off
  < HTTP/1.1 200 OK

<title>Login - Postal</title> <script src="/assets/application/application-0dd293ea0a8f7f37880ae5bea4a4f1627195bd86b17430b7fb0313790f195df8.js" data-turbolinks-track="reload"></script>

Welcome to Postal

• Forgotten your password?

but I am not able to get to postal through http://mysubdomain.mydomain.com:5000/ through my browser.
And I just can't figure out what's wrong here, any pointers?

[willpower232]

You would normally use caddy or nginx or similar rather than accessing port 5000 directly, I expect that is the issue here as newer Postal/ruby on rails is a bit more sensitive to the domains accessing it.

[nithinkumarmav]

Actually, I just created a subdomain today, so that might have been the problem. Thank you so much for your help; it was really great for me. After the DNS configuration, if it works or if there are any other issues, I’ll let you know.

[nithinkumarmav]

Also I’m setting up Postal on a VPS(digital ocean) and want to ensure optimal email deliverability. Could you please share:

1.Which VPS providers are best suited for running Postal, considering email deliverability?
2.Any best practices or configurations to minimize emails being flagged as spam when using a VPS with Postal?

Please help me this as well, so that it will not cause a problem

[willpower232]

They all have their upsides and downsides, don't really recommend one over the other. If you've found one which will allow you to send emails then you can stick with them as they're apparently quite rare these days.

If you make sure you have all the ticks on the screen when you add a domain to Postal, then you can use things like https://mail-tester.com and https://mxtoolbox.com to confirm the messages you're sending are as good as they can be.

[nithinkumarmav]

Thanks @willpower232 .
How about Katapult? May I ask if you have used Katapult before? if so, how was your experience with it?

[willpower232]

I haven't used it personally but I know the developers of Postal work closely with them so you'd hope Postal worked as well on there as it did anywhere else

[nithinkumarmav]

Hi, just following up on my question about setting up Postal on a VPS and ensuring good email deliverability. Would appreciate any advice. Thanks

[nithinkumarmav]

@willpower232 Could you please help to know the best suitable VPS for postal for US and UK market. We keep researching for different VPS but finding difficult to identify the best fit for postal,Objective is to reduce spam to minimum.
Since we are in the critical path of the project your guidance will be timely and help.
Thanks in advance.