fetchmail keep showing exit status 5

RT Users
1

My goal is to sync my emails across different devices.

My company has the email server. I log in on outlook via pop3 and it will download the emails onto my laptop via .pst file. The problem with pop3 is that every email that I sent will be stored locally and my other device won’t even see it.

I previously set my outlook this way:
Incoming Mail
mail.raraexample.com
Port 110

Outgoing mail
Port 1000
Encryption method none

Now, I want to use my UGreen NAS Docker to fetch pop3 emails from my company’s email server and act as a middleman. My laptop will just retrieve the files from my NAS (middleman) instead. But, after few hours set up, I’m seeing errors all day and I honestly don’t know what’s wrong.

Compose file

services:
  mailserver:
    image: ghcr.io/docker-mailserver/docker-mailserver:latest
    container_name: mailserver
    # Provide the FQDN of your mail server here (Your DNS MX record should point to this value)
    hostname: mail.raraexample.com
    ports:
      - "25:25"
      - "465:465"
      - "587:587"
      - "110:110"
      - "993:993"
    volumes:
      - ./docker-data/dms/mail-data/:/var/mail/
      - ./docker-data/dms/mail-state/:/var/mail-state/
      - ./docker-data/dms/mail-logs/:/var/log/mail/
      - ./docker-data/dms/config/:/tmp/docker-mailserver/
      - /etc/localtime:/etc/localtime:ro
    environment:
      - ENABLE_RSPAMD=0
      - ENABLE_POP3=1
      - ENABLE_FETCHMAIL=1
      - FETCHMAIL_POLL=300
      - ENABLE_CLAMAV=0
      - ENABLE_FAIL2BAN=0
    restart: always
    stop_grace_period: 1m
    # Uncomment if using `ENABLE_FAIL2BAN=1`:
    # cap_add:
    #   - NET_ADMIN

docker-data/dms/config/fetchmail.cf

poll mail.raraexample.com proto pop3
user ‘hero@raraexample.com’
pass ‘heropass’
is ‘hero@raraexample.com’
keep

Error message: **WARN exited: fetchmail (exit status 5; not expected)
**
What did I do wrong?

2

Hi @HeroVax, welcome.

I don’t have enough experience about docker so I’m going to answer the first question about syncing on different devices… AFAIK, you must change POP to IMAP, so the emails are kept in the server and other devices can read them.