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.
Summarize all messages (
Summarize messages that have one or more of the specified labels
Summarize messages that match the specified recipients
Summarize messages that have a match for the specified regexp
topic in their subjects (
Summarize messages whose headers match the specified regular expression
Summarize messages that match the specified senders.
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. This is matched
against the ‘To’, ‘From’, and ‘CC’ headers (supply a prefix
argument to exclude the ‘CC’ header).
C-M-t topic RET (
makes a partial summary mentioning only the messages whose subjects have
a match for the regular expression topic. 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.
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.