CLI for working with MBOX files.
mailfilter count inbox.mbox body=~/thank you/
Prints a count of messages that match the filter.
mailfilter extract inbox.mbox subject=~/thank you/
Mailfilter has a mini query language for selecting individual letters, which is loosely inspired by Lucene. For example:
subject!~/re:/i and body=~/tax/
This will match any letter that does not match the regular expression /re:/i
(case insensitive) and that contains the text tax in the body.
Filters are made up of multiple match statements which begin with a field, have an operator and then some value. The available operators are:
=~matches regular expression!~does not match regular expression^~starts with text$=ends with text!=does not match text=matches literal text
Multiple match statements can be joined together with and or or statements.
The filter program must be a single argument to mailfilter, so you'll often have to surround in quotes, e.g:
mailfilter extract inbox.mbox 'subject=~/thank you/ and body="AAA"'