mailpit: Support Request: White screen and console errors for web UI

The issue

I’m trying to replace Mailhog with Mailpit. I installed it using the script.

sudo bash < <(curl -sL https://raw.githubusercontent.com/axllent/mailpit/develop/install.sh)

I followed the steps here for how to enable Mailpit as a service. Honestly, this should be added to the Wiki.

Then, after stopping Mailhog and starting the Mailpit service (which starts successfully) and visiting the UI, I get these errors in the browser console, and I only see a white screen.

Refused to apply style from 'https://myweburl.example.com/dist/app.css?v1.9.2' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
GET https://myweburl.example.com/dist/app.js?v1.9.2 net::ERR_ABORTED 404 (Not Found)
Refused to execute script from 'https://myweburl.example.com/dist/app.js?v1.9.2' because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled.
GET https://myweburl.example.com/favicon.svg 404 (Not Found)

I don’t know where those files are on the system, or how I need to configure Mailpit or Nginx to get them to load.

Sending mail works (I think). I don’t see any errors when I send a test email.

Configuration info

PHP-FPM

The PHP config:

php_admin_value[sendmail_path] = /usr/local/bin/mailpit sendmail -t test@myweburl.example.com

In the above, I basically just replaced mailhog with mailpit.

Nginx

    ## Mailpit
    location ^~ /mailpit/ {
        proxy_pass http://localhost:8025/;
        proxy_set_header    Host             $host;
        proxy_set_header    X-Real-IP        $remote_addr;
        proxy_set_header    X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header    X-Client-Verify  SUCCESS;
        proxy_set_header    X-Client-DN      $ssl_client_s_dn;
        proxy_set_header    X-SSL-Subject    $ssl_client_s_dn;
        proxy_set_header    X-SSL-Issuer     $ssl_client_i_dn;
        proxy_read_timeout 1800;
        proxy_connect_timeout 1800;
        chunked_transfer_encoding on;
        proxy_set_header X-NginX-Proxy true;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_http_version 1.1;
        proxy_redirect off;
        proxy_buffering off;
    }

System info

• Ubuntu 20.04
• Nginx 1.18.0
• PHP 8.2
• Mailpit 1.9.2

Other notes

This issue looks similar to this one, but it’s not exactly the same: https://github.com/axllent/mailpit/issues/137