ipurge - delete mail from IMAP mailbox or partition based on age or size

ipurge [ -f ] [ -C config-file ] [ -x ] [ -X ] [ -i ] [ -s ]

Ipurge deletes messages from the mailbox(es) specified by mailbox-pattern that are older or larger than specified by the -d, -b, -k or -m options. If no mailbox-pattern is given, ipurge works on all mailboxes. If the -x option is given, the message age and size MUST match exactly those specified by -d, -b, -k or -m. The are no default values, and at least one of -d, -b, -k or -m MUST be specified.

Ipurge by default only deletes mail below shared folders, which means that mails in mailbox(es) below INBOX.* and user.* stay untouched. Use the option -f to also delete mail in mailbox(es) below these folders.

Ipurge reads its configuration options out of the imapd.conf(5) file unless specified otherwise by -C.

-f Force deletion of mail in all mailboxes.
-C config-file
-d days
-b bytes
-k Kbytes
-m Mbytes
-x Perform an exact match on age or size (instead of older or larger).
-X Use delivery time instead of Date: header for date matches
-i Invert match logic: -x means not equal, date is for newer, size is for smaller
-s Skip over messages that have the \Flagged flag set.

/etc/imapd.conf