SMTP 서버(mailjet)로 메일을 보낼 수 없습니다

안녕하세요! 메일 전송에 대해 질문이 있습니다. 도움을 주시면 감사하겠습니다 :smiling_face_with_three_hearts:

SMTP 서버로 Mailjet을 사용 중입니다. 해당 주제(Howto use Mailjet as a free SMTP service for Discourse)를 참고하여 app.yml을 설정했고, Mailjet에서 도메인과 메일 주소를 인증했습니다. 포트 80, 443, 587, 553을 개방했습니다.

하지만 테스트 메일을 보내면 아무 반응이 없습니다.


제 app.yml 파일은 다음과 같습니다.

## this is the all-in-one, standalone Discourse Docker container template
##
## After making changes to this file, you MUST rebuild
## /var/discourse/launcher rebuild app
##
## BE *VERY* CAREFUL WHEN EDITING!
## YAML FILES ARE SUPER SUPER SENSITIVE TO MISTAKES IN WHITESPACE OR ALIGNMENT!
## visit http://www.yamllint.com/ to validate this file as needed

templates:
  - "templates/postgres.template.yml"
  - "templates/redis.template.yml"
  - "templates/web.template.yml"
  ## Uncomment the next line to enable the IPv6 listener
  #- "templates/web.ipv6.template.yml"
  - "templates/web.ratelimited.template.yml"
  ## Uncomment these two lines if you wish to add Lets Encrypt (https)
  - "templates/web.ssl.template.yml"
  - "templates/web.letsencrypt.ssl.template.yml"
  - "templates/web.china.template.yml"

## which TCP/IP ports should this container expose?
## If you want Discourse to share a port with another webserver like Apache or nginx,
## see https://meta.discourse.org/t/17247 for details
expose:
  - "80:80"   # http
  - "443:443" # https
  - "553:553"
  - "587:587"
params:
  db_default_text_search_config: "pg_catalog.english"

  ## Set db_shared_buffers to a max of 25% of the total memory.
  ## will be set automatically by bootstrap based on detected RAM, or you can override
  db_shared_buffers: "128MB"

  ## can improve sorting performance, but adds memory usage per-connection
  #db_work_mem: "40MB"

  ## Which Git revision should this container use? (default: tests-passed)
  #version: tests-passed

env:
  LC_ALL: en_US.UTF-8
  LANG: en_US.UTF-8
  LANGUAGE: en_US.UTF-8
  # DISCOURSE_DEFAULT_LOCALE: en

  ## How many concurrent web requests are supported? Depends on memory and CPU cores.
  ## will be set automatically by bootstrap based on detected CPUs, or you can override
  UNICORN_WORKERS: 2

  ## TODO: The domain name this Discourse instance will respond to
  ## Required. Discourse will not work with a bare IP number.
  DISCOURSE_HOSTNAME: discuss.whitewater.wang

  ## Uncomment if you want the container to be started with the same
  ## hostname (-h option) as specified above (default "$hostname-$config")
  #DOCKER_USE_HOSTNAME: true

  ## TODO: List of comma delimited emails that will be made admin and developer
  ## on initial signup example 'user1@example.com,user2@example.com'
  DISCOURSE_DEVELOPER_EMAILS: 'whitewatercn@outlook.com'

  ## TODO: The SMTP mail server used to validate new accounts and send notifications
  # SMTP ADDRESS, username, and password are required
  # WARNING the char '#' in SMTP password can cause problems!
  DISCOURSE_SMTP_ADDRESS: in-v3.mailjet.com
  DISCOURSE_SMTP_PORT: 587
  DISCOURSE_SMTP_USER_NAME: 7b14af9b5034******
  DISCOURSE_SMTP_PASSWORD: "46764f565******"
  #DISCOURSE_SMTP_ENABLE_START_TLS: true           # (optional, default true)
  # DISCOURSE_SMTP_DOMAIN: beginner.center
  # DISCOURSE_NOTIFICATION_EMAIL: noreply@discuss.whitewater.wang
  # DISCOURSE_SMTP_AUTHENTICATION: login
  DISCOURSE_SMTP_OPENSSL_VERIFY_MODE: none
  # DISCOURSE_SMTP_ENABLE_START_TLS: true


  ## If you added the Lets Encrypt template, uncomment below to get a free SSL certificate
  LETSENCRYPT_ACCOUNT_EMAIL: me@example.com

  ## The http or https CDN address for this Discourse instance (configured to pull)
  ## see https://meta.discourse.org/t/14857 for details
  #DISCOURSE_CDN_URL: https://discourse-cdn.example.com
  
  ## The maxmind geolocation IP address key for IP address lookup
  ## see https://meta.discourse.org/t/-/137387/23 for details
  #DISCOURSE_MAXMIND_LICENSE_KEY: 1234567890123456

## The Docker container is stateless; all data is stored in /shared
volumes:
  - volume:
      host: /var/discourse/shared/standalone
      guest: /shared
  - volume:
      host: /var/discourse/shared/standalone/log/var-log
      guest: /var/log

## Plugins go here
## see https://meta.discourse.org/t/19157 for details
hooks:
  after_code:
    - exec:
        cd: $home/plugins
        cmd:
          - git clone https://github.com/discourse/docker_manager.git

## Any custom commands to run after building
run:
  - exec: echo "Beginning of custom commands"
  ## If you want to set the 'From' email address for your first registration, uncomment and change:
  ## After getting the first signup email, re-comment the line. It only needs to run once.
  - exec: rails r "SiteSetting.notification_email='noreply@discuss.whitewater.wang'"
  - exec: echo "End of custom commands"

@Lhc_fl 선배님, 좀 봐 주실 수 있을까요?

이것은 문제가 discourse가 아니라 mailjet에 있다는 것을 시사합니다.

./launcher enter app을 입력하여 docker 컨테이너에 진입한 후, rake email:test[example@outlook.com]을 실행하여 이메일 사용 가능 여부를 테스트해 보세요.

선생님, 답변 주셔서 감사합니다! 테스트 명령어를 실행해 봤는데, 타임아웃이 발생했습니다.

root@iZ0jlfiypegsmh5fpig7t4Z-app:/var/www/discourse# rake emails:test[whitewatercn@outlook.com]
Testing sending to whitewatercn@outlook.com using in-v3.mailjet.com:587, username:7b14af9b5034dd6e7639d19587cb7831 with plain auth.
SMTP server connection successful.
Sending to whitewatercn@outlook.com. . . 
Sending mail failed.
JavaScript was terminated (either by timeout or explicitly)

이제 보낼 수는 있지만, 이메일을 받지 못했습니다.

root@iZ0jlfiypegsmh5fpig7t4Z-app:/var/www/discourse# rake emails:test[whitewatercn@outlook.com]
Testing sending to whitewatercn@outlook.com using in-v3.mailjet.com:587, username:7b14af9b5034dd6e7639d19587cb7831 with plain auth.
SMTP server connection successful.
Sending to whitewatercn@outlook.com. . . 
Mail accepted by SMTP server.
Message-ID: fc301347-746b-4b89-8c07-deeb1ee467a4@discuss.whitewater.wang

If you do not receive the message, check your SPAM folder
or test again using a service like http://www.mail-tester.com/.

If the message is not delivered it is not a problem with Discourse.
Check the SMTP server logs for the above Message ID to see why it
failed to deliver the message.

Mailgun으로 변경했는데, 이제 사용할 수 있습니다 :upside_down_face:

malign 서버로 변경했는데, 이제 사용할 수 있습니다 :upside_down_face: