==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):
1.5.1 MARIADB edition
- Deployed with iRedMail Easy or the downloadable installer? Easy
- Linux/BSD distribution name and version: AlmaLinux 8.5 (Arctic Sphynx)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): 10.3.28-MariaDB
- Web server (Apache or Nginx): nginx/1.14.1
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Suddenly, my SOGo had been gone. I guess, this had been immediately after upgrading my iRed installation using yum update --allowerasing

I wanted to reinstall it, however, it does not work. I get error messages saying all mirrors for RPMS/sope49-sbjson-2.3.1-20220311_1664.el8.1.1.x86_64.rpm are down, if I execute:
yum install sogo sope49-gdl1-mysql sogo-activesync sogo-ealarms-notify sogo-tool.

And next step would be: configuring SOGo properly. There is a blog on how to do this, however, it's outdated and based on CenOS 6 (https://docs.iredmail.org/sogo-centos-6-mysql.html)

Fixing this issue would be worthwhile sending a cup of coffee, probably even two

-----------------------

[root@email ~]# yum install sogo sope49-gdl1-mysql sogo-activesync sogo-ealarms-notify sogo-tool
Letzte Prüfung auf abgelaufene Metadaten: vor 0:01:41 am Mo 21 Mär 2022 16:48:42 CET.
Das Paket sope49-gdl1-mysql-4.9-20220311_1664.el8.1.1.x86_64 ist bereits installiert.
Das Paket sogo-ealarms-notify-5.5.1.20220320-1.el8.x86_64 ist bereits installiert.
Abhängigkeiten sind aufgelöst.
===========================================================================================
Package                      Arch       Version                            Repo      Size
===========================================================================================
Installieren:
sogo                         x86_64     5.5.1.20220321-1.el8               SOGo      20 M
sogo-activesync              x86_64     5.5.1.20220321-1.el8               SOGo     147 k
sogo-tool                    x86_64     5.5.1.20220321-1.el8               SOGo      64 k
Aktualisieren:
sogo-ealarms-notify          x86_64     5.5.1.20220321-1.el8               SOGo      20 k
sope49-cards                 x86_64     5.5.1.20220321-1.el8               SOGo     216 k
sope49-gdl1-contentstore     x86_64     5.5.1.20220321-1.el8               SOGo      71 k
Abhängigkeiten werden installiert:
sope49-sbjson                x86_64     2.3.1-20220311_1664.el8.1.1        SOGo      23 k
Herunterstufen:
gnustep-base                 x86_64     1.24.9-1.el8                       SOGo     280 k
gnustep-base-libs            x86_64     1.24.9-1.el8                       SOGo     2.1 M

Transaktionsübersicht
===========================================================================================
Installieren   4 Pakete
Aktualisieren  3 Pakete
Zurücksetzen   2 Pakete

Gesamte Downloadgröße: 23 M
Ist dies in Ordnung? [j/N]:
Pakete werden heruntergeladen:
(1/9): gnustep-base-1.24.9-1.el8.x86_64.rpm                1.3 MB/s | 280 kB     00:00
(2/9): sogo-activesync-5.5.1.20220321-1.el8.x86_64.rpm     880 kB/s | 147 kB     00:00
(3/9): sogo-tool-5.5.1.20220321-1.el8.x86_64.rpm           463 kB/s |  64 kB     00:00
[MIRROR] sope49-sbjson-2.3.1-20220311_1664.el8.1.1.x86_64.rpm: Downloading successful, but checksum doesn't match. Calculated: 077c1407d4e60a72ced3035e84a7afff9136e5d92e0440a00a1fc4421ff085e3(sha256)  Expected: 0e18b3aa1ade5be94e8ff01d38cdc63c6dfa4a5233404393a94ba6400847de91(sha256)
[MIRROR] sope49-sbjson-2.3.1-20220311_1664.el8.1.1.x86_64.rpm: Downloading successful, but checksum doesn't match. Calculated: 077c1407d4e60a72ced3035e84a7afff9136e5d92e0440a00a1fc4421ff085e3(sha256)  Expected: 0e18b3aa1ade5be94e8ff01d38cdc63c6dfa4a5233404393a94ba6400847de91(sha256)
[MIRROR] sope49-sbjson-2.3.1-20220311_1664.el8.1.1.x86_64.rpm: Downloading successful, but checksum doesn't match. Calculated: 077c1407d4e60a72ced3035e84a7afff9136e5d92e0440a00a1fc4421ff085e3(sha256)  Expected: 0e18b3aa1ade5be94e8ff01d38cdc63c6dfa4a5233404393a94ba6400847de91(sha256)
[MIRROR] sope49-sbjson-2.3.1-20220311_1664.el8.1.1.x86_64.rpm: Downloading successful, but checksum doesn't match. Calculated: 077c1407d4e60a72ced3035e84a7afff9136e5d92e0440a00a1fc4421ff085e3(sha256)  Expected: 0e18b3aa1ade5be94e8ff01d38cdc63c6dfa4a5233404393a94ba6400847de91(sha256)
[FAILED] sope49-sbjson-2.3.1-20220311_1664.el8.1.1.x86_64.rpm: No more mirrors to try - All mirrors were already tried without success
(5-6/9): sogo-5.5.1.202203 14% [===-                     ] 2.6 MB/s | 3.4 MB     00:07 ETA
Die heruntergeladenen Pakete wurden bis zur nächsten erfolgreichen Transaktion im Zwischenspeicher abgelegt.
Sie können zwischengespeicherte Pakete mit dem Befehl »yum clean packages« entfernen.
Fehler: Fehler beim Herunterladen der Pakete:
  Cannot download RPMS/sope49-sbjson-2.3.1-20220311_1664.el8.1.1.x86_64.rpm: All mirrors were tried