Opening the Mail-Manager displays an error message.
The SMTP Quarantine and SMTP Log tabs are affected, SMTP Spool and POP3 Quarantine not.
SMTP Quarantine Tab:
Perl runtime error calling qm::smtp_quarantine: Can't use an undefined value as an ARRAY reference at /DBI.pm line 2064.
SMTP Log tab:
Perl runtime error calling qm::smtp_log: Can't use an undefined value as an ARRAY reference at /DBI.pm line 2064.
