Prepare Your System
Before you run mailcow: dockerized, there are a few requirements that you should check:
When running mailcow: dockerized on a Debian 8 (Jessie) box, you should switch to kernel 4.9 from Jessie backports to avoid a bug when running Docker containers with healthchecks! For more details read: github.com/docker/docker/issues/30402
- mailcow: dockerized requires some ports to be open for incomming connections, so make sure that your firewall is not bloking these. Also make sure that no other application is interferring with mailcow's configuration.
- A correct DNS setup is crucial to every good mailserver setup, so please make sure you got at least the basics covered bevore you begin!
- Make sure that your system has a correct date and time setup. This is crucial for stuff like two factor TOTP authentication.
Minimum System Resources¶
Please make sure that your system has at least the following resources:
|RAM||1 GiB (or better 1,5 GiB + Swap)|
|Disk||5 GiB (without emails)|
ClamAV is a greedy RAM muncher. You can disable it in
mailcow.conf by settings SKIP_CLAMD=y.
Firewall & Ports¶
Please check if any of mailcow's standard ports are open and not in use by other applications:
# netstat -tulpn | grep -E -w '25|80|110|143|443|465|587|993|995'
If this command returns any results please remove or stop the application running on that port. You may also adjust mailcows ports via the
mailcow.conf configuration file.
If you have a firewall already up and running please make sure that these ports are open for incoming connections:
To bind a service to an IP address, you can prepend the IP like this:
Important: You cannot use IP:PORT bindings in HTTP_PORT and HTTPS_PORT. Please use
Date and Time¶
To ensure that you have the correct date and time setup on your system, please check the output of
$ timedatectl status Local time: Sat 2017-05-06 02:12:33 CEST Universal time: Sat 2017-05-06 00:12:33 UTC RTC time: Sat 2017-05-06 00:12:32 Time zone: Europe/Berlin (CEST, +0200) NTP enabled: yes NTP synchronized: yes RTC in local TZ: no DST active: yes Last DST change: DST began at Sun 2017-03-26 01:59:59 CET Sun 2017-03-26 03:00:00 CEST Next DST change: DST ends (the clock jumps one hour backwards) at Sun 2017-10-29 02:59:59 CEST Sun 2017-10-29 02:00:00 CET
NTP enabled: yes and
NTP synchronized: yes indicate wether you have NTP enabled and if it's synchronized.
To enable NTP you need to run the command
timedatectl set-ntp true. You also need to edit your
# vim /etc/systemd/timesyncd.conf [Time] Servers=0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org