Here are the commands to create a summary for the current Rmail buffer. Once the Rmail buffer has a summary, changes in the Rmail buffer (such as deleting or expunging messages, and getting new mail) automatically update the summary.
The h or C-M-h (
rmail-summary) command fills the summary buffer
for the current Rmail buffer with a summary of all the messages in the buffer.
It then displays and selects the summary buffer in another window.
C-M-l labels <RET> (
a partial summary mentioning only the messages that have one or more of the
labels labels. labels should contain label names separated by
C-M-r rcpts <RET> (
makes a partial summary mentioning only the messages that have one or
more recipients matching the regular expression rcpts. You can
use commas to separate multiple regular expressions. These are matched
against the ‘To’, ‘From’, and ‘CC’ headers (supply a prefix
argument to exclude this header).
C-M-t topic <RET> (
makes a partial summary mentioning only the messages whose subjects have
a match for the regular expression topic. You can use commas to
separate multiple regular expressions. With a prefix argument, the
match is against the whole message, not just the subject.
C-M-s regexp <RET> (
makes a partial summary that mentions only the messages whose headers
(including the date and the subject lines) match the regular
C-M-f senders <RET> (
makes a partial summary that mentions only the messages whose ‘From’
fields match the regular expression senders. You can use commas to
separate multiple regular expressions.
Note that there is only one summary buffer for any Rmail buffer; making any kind of summary discards any previous summary.
rmail-summary-window-size says how many lines to
use for the summary window. The variable
rmail-summary-line-count-flag controls whether the summary line
for a message should include the line count of the message. Setting
this option to nil might speed up the generation of summaries.