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techne/lemmy.org
Jeffrey Serio 42e94ae6f5 Add lemmy.org
2024-09-29 02:31:39 -05:00

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Lemmy

Configure SPF and DKIM for SMTP postfix-relay

Source: https://github.com/wader/postfix-relay#spf

  • Add remote forwarding for rsyslog.
  • Make the DKIM keys persist indefinitely in a volume at ./volumes/postfix-dkim:/etc/opendkim/keys.
  • ./volumes is relative to the parent directory of the docker-compose.yml file for the Lemmy instance. E.g. /docker/lemmy/volumes.

Edit docker-compose.yml:

postfix:
  image: mwader/postfix-relay
  environment:
    - POSTFIX_myhostname=lemmy.hyperreal.coffee
    - OPENDKIM_DOMAINS=lemmy.hyperreal.coffee
    - RSYSLOG_TO_FILE=yes
    - RSYSLOG_TIMESTAMP=yes
    - RSYSLOG_REMOTE_HOST=<ip addr of remote logging server>
    - RSYSLOG_REMOTE_PORT=514
    - RSYSLOG_REMOTE_TEMPLATE=RSYSLOG_ForwardFormat
  volumes:
    - ./volumes/postfix-dkim:/etc/opendkim/keys
    - ./volumes/logs:/var/log
  restart: "always"
  logging: *default-logging
docker-compose up -d

On domain registrar, add the following TXT records:

Type Name Content
TXT lemmy "v=spf1 a max ipv4:<ip addr of server> -all"
TXT mail._domainkey.lemmy "v=DKIM1; h=sha256; k=rsa; p=<pubkey>"

The content of mail._domainkey.lemmy is obtained from the log output of the wader/postfix-relay Docker container.

docker logs lemmy-postfix-1

To test this, allow a few hours for the DNS changes to propagate, then log out of the Lemmy instance and send a password reset request. If the reset confirmation email doesn't go to the spam folder, it works. The email service provider will be able to determine the email is from an authentic email address.

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