not sure about the module by itself, but when it's used with Log::Log4perl there's a way....

use Log::Log4perl;
Log::Log4perl::init(\<<'_EOL_');
log4j.rootLogger = DEBUG, Email
log4j.appender.Email = Log::Dispatch::Email::MailSendmail
log4j.appender.Email.smtp = mail.mydom.com
log4j.appender.Email.to = admin@mydom.com
log4j.appender.Email.from = me@mydom.com
log4j.appender.Email.buffered = 1
#log4j.appender.Email.subject = 
log4j.appender.Email.layout = Log::Log4perl::Layout::SimpleLayout
_EOL_
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i would think you could just add it the same way you add the to/from/subject info to a Log::Dispatch::Email object.