Perl module to analyze bounce mails

 Sisimai is the system formerly known as bounceHammer 4. It is a Perl module
 for analyzing bounce mails and generate structured data in a JSON format
 (YAML is also available if "YAML" module is installed on your system) from
 parsed bounce messages. Sisimai is a coined word: Sisi (the number 4 is
 pronounced "Si" in Japanese) and MAI (acronym of "Mail Analyzing Interface").