Specifying a subnet other than 172.22.1

mfj

I have a couple of other docker-compose based services running on the same host as mailcow and occasionally it happens that another service already has created a subnet on 172.22.1 and then mailcow fails to start. I would like to specify another subnet that is outside of the range of 172.1.1 - 172.50.1.

I have tried to set IPV4_NETWORKS=172.63.1 in mailcow.conf and run ./update.sh however this resulted in the mail server not reachable and/or emails not being received.

I assume it is related to https://community.mailcow.email/d/85-cant-send-or-receive-email though I am not sure.

Questions:
a) What is a valid network here?
b) Is updating mailcow.conf and running ./update.sh the proper way to switch the network?

Thanks + best regards!

MAGIC

Read the mailcow.conf!

# Internal IPv4 /24 subnet, format n.n.n (expands to n.n.n.0/24)
# Use private IPv4 addresses only, see https://en.wikipedia.org/wiki/Private_network#Private_IPv4_addresses

You just used T-Mobile USA IP range: https://dnslytics.com/ip/172.63.1.0

b) Just do a down && up -d to change this setting