MailScanner fails to start with startup errors matching:
Can't locate Sys/Hostname/Long.pm in @INC (you may need to install the Sys::Hostname::Long module) (@INC contains: /usr/mailscanner/usr/share/MailScanner/perl /usr/mailscanner/usr/share/MailScanner/perl /usr/...el_lib/x86_64-linux-6
If a server is using either of these ConfigServer MailScanner installer/products below, with the listed versions or lower:
MailScanner Installer (msinstall) version 3.17 or lower - https://www.configserver.com/free/mailscanner.html
MailScanner Front-End (MSFE) version 8.28 or lower - https://www.configserver.com/cp/msfe.html
MailScanner will not start due to the switch to Perl 5.3.0.
This has been fixed in newer versions of MailScanner and the software should be updated per their instructions here: