==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.4.2
- Deployed with iRedMail Easy or the downloadable installer? download
- Linux/BSD distribution name and version: FreeBSD 12
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? yes (but not yet installed here)
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I'm initiating a new installation of Iredmail and get into some issue:

[ INFO ] Checking configuration file: /root/iRedMail-1.4.2/config ... [FOUND]
< Question > Use it for mail server setting? [y|N]y
[ INFO ] Use config file: /root/iRedMail-1.4.2/config for mail server setting.
[ INFO ] Import installation process status from file: /root/iRedMail-1.4.2/runtime/install.status.
[ INFO ] Ports tree: /usr/ports
[ INFO ] Fetching all distfiles for required ports (make fetch-recursive)
[ INFO ] Fetching all distfiles for port: devel/py-Jinja2
===> Fetching all distfiles for py38-Jinja2-2.11.2_1 and dependencies
===>   py38-Jinja2-2.11.2_1 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by py38-Jinja2-2.11.2_1 for building
===> Fetching all distfiles required by pkg-1.16.3 for building
===>   py38-setuptools-44.0.0 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by py38-setuptools-44.0.0 for building
===>   python38-3.8.7 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by python38-3.8.7 for building
===>   pkgconf-1.7.3,1 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by pkgconf-1.7.3,1 for building
===>   kyua-0.13_5,3 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by kyua-0.13_5,3 for building
===>   atf-0.21 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by atf-0.21 for building
===>   lutok-0.4_7 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by lutok-0.4_7 for building
===>   lua52-5.2.4 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by lua52-5.2.4 for building
===>   libedit-3.1.20191231,1 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by libedit-3.1.20191231,1 for building
===>   sqlite3-3.34.0,1 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by sqlite3-3.34.0,1 for building
===>  openssl-1.1.1k,1 Invalid perl5 version 5.34.
*** Error code 1

Stop.
make[1]: stopped in /basejail/usr/ports/security/openssl
*** Error code 1

Stop.
make: stopped in /basejail/usr/ports/devel/py-Jinja2
<< ERROR >> Tarballs were not downloaded correctly, please fix it manually and then re-execute iRedMail.sh.

this is due to something that iredmail added to the /etc/make.conf "DEFAULT_VERSIONS [..] perl5=5.34"
When using quarterly port branches (which i believe is now the default for FreeBSD) perl 5.34 is not yet available.

Removing that entry allows the installer to continue.