There is a log4j implementation for perl. It is not affected by that advisory. It's just the java implementtions of log4j 2.4x (as I understand it).
Some java/jvm/jre implementations (e.g. Lucee) use log4j. But Lucee for example uses log4j 1.2x, which is not affected.
If you are running java, search your .jar files for log4j
]# find / -name *.jar | grep log4j
iredmail never used java, and i guess will never do so aswell