This is a set of scripts to simplify handling DMARC aggregate reports for low-volume email servers. Some explanations can be found in this blog article. No support is provided, use at your own risk.

Requirements: Jinja2

dmarc2html.py is a command line conversion script. It takes the path to the aggregate report file as parameter and outputs HTML code.

filter.py is an OpenSMTPd filter process, to be used in smtpd.conf like this:

filter dmarc2html proc-exec "/opt/dmarc2html/filter.py dmarc"

For any email to the dmarc@… account (or any other account specified as command line parameter), it will process the attachment and replace the email’s main part by the resulting HTML code.