Related: I recently used mbsync and notmuch to clean-up my Outlook/Live/Office email account. A one-liner to get email count per domain: notmuch address '*

Related: I recently used mbsync and notmuch to clean-up my Outlook/Live/Office email account. A one-liner to get email count per domain: notmuch address '*' | sed "s/^.*@//" | sed "s/>\$//" | sort | uniq > domains.txt To "delete" emails (move them to the deleted folder): notmuch search --output=files --format=text0 '(tag:whatever and not folder:Deleted' | xargs -0 --no-run-if-empty mv -t ~/.mail/live/Deleted/new/ Useful alternative to this for non-Gmail. The Outlook interface couldn't delete more than a few hundred mails.