Remove postinstall and bash-based mail check

packaging/scripts/check

@@ -34,13 +34,3 @@ if ps -u "$APP_USER" -f | grep -q "rake jobs:work" ; then
 else
   log_ko "openproject background job worker is NOT running"
 fi
-
-if [ -z "$ADMIN_EMAIL" ]; then
-  log_ko "no ADMIN_EMAIL set. Can't test email settings."
-else
-  if $(pwd)/packaging/scripts/send-test-email ; then
-    log_ok "test email sent to ${ADMIN_EMAIL}"
-  else
-    log_ko "unable to send test email to ${ADMIN_EMAIL}"
-  fi
-fi

packaging/scripts/send-test-email

@@ -1,47 +0,0 @@
-#!/usr/bin/env ruby
-
-require 'net/smtp'
-require 'time'
-require 'securerandom'
-require 'tempfile'
-
-admin_email = ENV.fetch('ADMIN_EMAIL') { fail "no ADMIN_EMAIL set" }
-smtp_domain = ENV.fetch('SMTP_DOMAIN') { "example.net" }
-from = "no-reply@#{smtp_domain}"
-delivery_method = ENV.fetch('EMAIL_DELIVERY_METHOD') { "sendmail" }
-
-msgstr = <<~END_OF_MESSAGE
-    From: OpenProject <#{from}>
-    To: #{admin_email}
-    Subject: Test message
-    Date: #{Time.now.httpdate}
-    Message-Id: <#{SecureRandom.hex}@#{smtp_domain}>
-  #{'  '}
-    This is a test message to verify your OpenProject settings.
-    If you see this, this means OpenProject email settings are working properly.
-END_OF_MESSAGE
-
-if delivery_method == "sendmail"
-  puts "sending test email using sendmail..."
-  tmpfile = Tempfile.new("mail-test")
-  File.open(tmpfile.path, "w+") { |f| f << msgstr }
-  system("cat #{tmpfile.path} | sendmail -i -t") || exit(1)
-else
-  smtp_authentication = ENV.fetch('SMTP_AUTHENTICATION', "none").to_sym
-  # set authentication to nil because :none is not supported by SMTP module
-  smtp_authentication = nil if smtp_authentication == :none
-  puts "sending test email using SMTP..."
-  smtp = Net::SMTP.new(
-    ENV.fetch('SMTP_HOST'),
-    ENV.fetch('SMTP_PORT')
-  )
-  smtp.enable_starttls_auto if ENV.fetch('SMTP_ENABLE_STARTTLS_AUTO', 'false') == 'true'
-  smtp.start(
-    ENV.fetch('SMTP_DOMAIN'),
-    ENV.fetch('SMTP_USERNAME', nil),
-    ENV.fetch('SMTP_PASSWORD', nil),
-    smtp_authentication
-  )
-  smtp.send_message msgstr, from, admin_email
-  smtp.finish
-end