+ <b>--deduplicate=(no|mailbox|address)</b>
+ Control the deduplication of results.
+
+ <b>no</b> Output all occurences of addresses in the matching mes‐
+ sages. This is not applicable with --output=count.
+
+ <b>mailbox</b>
+ Deduplicate addresses based on the full, case sensitive
+ name and email address, or mailbox. This is effectively
+ the same as piping the --deduplicate=no output to <b>sort</b> <b>|</b>
+ <b>uniq</b>, except for the order of results. This is the
+ default.
+
+ <b>address</b>
+ Deduplicate addresses based on the case insensitive
+ address part of the mailbox. Of all the variants (with
+ different name or case), print the one occurring most
+ frequently among the matching messages. If --output=count
+ is specified, include all variants in the count.
+