[otrs] Max attachment size?

PostMasterPOP3.pl produces the occasional error: Invalid conversion in sprintf: "%'" at /usr/perl5/5.6.1/lib/sun4-solaris-64int/Sys/Syslog.pm line 241, <PRODUCT> line 4. Which I believe is related to email attachments being too large. Does anyone know what the maximum size is, and if it can be increased?