Don't allow filters to alter envelope from and to anymore. It was unused anyway
Extract method
Inline logic for handling blacklisted emails. Don't use filters anymore
Make apply_html always true
Extract master filter
Always process html and text versions now
Inline methods
Multipart email has at least either text or html part
Update code comment
Rename attribute
Pass in delivery to date method when filtering
Pass delivery down when processing text and html
Get rid of filter delegation
Use filter initializer just to setup filter chain
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