Heads up: Don't upgrade your iRedMail server from CentOS 7 to 8, or Ubuntu 18.04 to 20.04 shortly

[Zhang Huangbin]

Dear all,

Another great Ubuntu LTS release, 20.04, was out days ago (April 23rd 2020), but
please don't upgrade your iRedMail server to 20.04 shortly. Also don't upgrade
from CentOS 7 to 8 shortly. Few core services will be broken after upgraded:

*) iRedAPD: a simple Postfix policy server. It handles greylisting, blacklisting,
whitelisting, throttling, sender login mismatch checks, mailing list access control,
etc. It listens on port 7777 by default, optionally on extra ports 7778, 7779 for
SRS (Sender Rewrite Scheme).

*) mlmmjadmin: a RESTful API server for managing subscribeable (mlmmj) mailing
lists. It listens on port 7790 by default.

*) iRedAdmin and iRedAdmin-Pro: the official web based iRedMail server admin
panel. It listens on port 7791 by default, accessible by URL https://<your-server>/iredadmin/.

All of them are written in Python 2, but CentOS 8 and Ubuntu 20.04 don't offer
Python modules for Python 2 anymore, so after upgraded to new major (OS) release,
above softwares will be broken and you need to install required Python modules
with the "pip" tool manually. We will start porting them to Python 3 shortly and it
may take few months. Please be patient and give us some more time.

----
Zhang Huangbin, founder of iRedMail project: https://www.iredmail.org/